^sfzr/j' Vrr mfi t,'i;>iwt;%'i'/y,* if si THE LIBRARY OF THE UNIVERSITY OF CALIFORNIA BEQUEST OF ANITA D. S. BLAKE K 4)i Digitized by the Internet Arciiive in 2007 with funding from IVIicrosoft Corporation http://www.archive.org/details/elementsofperspeOOruskrich THE ELEMENTS OF PEESPECTIVE. toNDOir j-BTNTEJ BT SPOTTISWOODE ATfD CO. yBW-STBEET SQTTABB THE ELEMENTS OF PERSPECTIVE ARRANGED FOR THE USE OF SCHOOLS AND INTENDED TO Be" BEAD IN CONNEXION WITH THE PIEST THEEE BOOKS OF EUCLID. BY JOHN RUSKIN, M.A. Author of "modern painters," "seven lamps of architecture," 'stones of VENICE," "LECTURES ON ARCHITECTURE AND PAINTING, "elements of DRAWING," ETC. LONDON SMITH, ELDEE, AND CO., 65 COENHILL. 1859 The right of tramlation is reterv? 7, PEE FACE For some time back I have felt the want, among Students of Drawing, of a written code of accurate Perspective Law; the modes of construction in common use being various, and, for some problems, insufficient. It would have been desirable to draw up such a code in popular language, so as to do away with the most repulsive difficulties of the subject ; but finding this popularization would be im- possible, without elaborate figures and long explanations, such as I had no leisure to pre- pare, I have arranged the necessary rules in A 4 VI PKEFACE. a short mathematical form, which any school- boy may read through in a few days, after he has mastered the first three and the sixth books of Euchd. Some awkward compromises have been admitted between the first-attempted popu- lar explanation, and the severer arrangement, involving irregular lettering and redundant phraseology ; but I cannot for the present do more, and leave the book therefore to its trial, hoping that, if it be found by masters of schools to answer its pm^pose, I may here- after bring it into better form.* * Some irregularities of arrangement have been admitted merely for the sake of convenient reference; the eighth problem, for instance, ought to have been given as a case of the seventh, but is separately enunciated on account of its importance. Several constructions, which ought to have been given as problems, are on the contrary given as corollaries, in order to keep the more directly connected problems in closer se- quence ;. thus the construction of rectangles and polygcms \n vertical planes would appear by the Table of Contents to have been omitted, being given in the corollary to Problem IX. PREFACE. VU An account of practical methods, sufficient for general purposes of sketching, might in- deed have been set down in much less space : but if the student reads the following pages carefully, he will not only find himself able, on occasion, to solve perspective pro- blems of a complexity greater than the ordi- nary rules will reach, but obtain a clue to many important laws of pictorial efiect, no less than of outline. The subject thus exa- mined becomes, at least to my mind, very cmious and interesting ; but, for students who are unable or unwilling to take it up in this abstract form, I beheve good help will be soon furnished, in a series of illustrations of practical perspective now in preparation by Mr. Le Vengem. I have not seen this essay in an advanced state, but the illustrations shown to me were very clear and good ; and, as the author has devoted much thought to VIU PREFACE. their arrangement, I hope that his work will be precisely what is wanted by the general learner. Students wishing to pursue the subject into its more extended branches will find, I beheve, Cloquet's treatise the best hitherto pubhshed.* * Xouveau Traite Elementaire de Perspective. Bachelier, 1823. CONTENTS. Page Preface v Introduction PROBLEM L To FIX THE Position op a given Point . . , .18 PROBLEM IL To DRAW A Right Line between two given Points . 22 PROBLEM in. To FIND the Vanishing-Point of a given Horizontal Line 27 PROBLEM IV. To FIND THE Dividing-Points of a given Horizontal Line 36 X CONTENTS. PROBLEM V. * Page To DRAW A Horizontal Line, given in Position and Magnitude, by means op its Sight-Magnitude and Dividing-Points 37 i»ROBLEM VL To DRAW ANY TrIANGLE, GIVEN IN POSITION AND MAGNI- TUDE, IN A Horizontal Plane 41 PROBLEM VIL To draw any Rectilinear Quadrilateral Figure, given IN Position and Magnitude, in a Horizontal Plane 43 PROBLEM VIH. To DRAW A Square, given in Position and Magnitude, IN A Horizontal Plane 45 PROBLEM IX. To DRAW A Square Pillar, given in Position and Magnitude, its Base and Top being in Horizontal Planes 50 PROBLEM X. To draw a Pyramid, given in Position and Magnitude, ON A Square Base in a Horizontal Plane . . 53 PROBLEM XI. To DRAW ANY CURVE IN A HORIZONTAL OR VERTICAL PlANB 55 CONTENTS. XI PEOBLEM XIL Page To DIVIDE A Circle drawn in Perspective into ant GIVEN Number of Equal Parts 61 PROBLEM XIII. To DRAW A Square given in Magnitude, within a larger Square given in Position and Magnitude; the Sides OF the two Squares being Parallel . . . .65 PROBLEM XIV. To draw a Truncated Circular Cone, given in Posi- tion AND Magnitude, the Truncations being in Ho- rizontal Planes, and the Axis of the Cone vertical 67 PROBLEM XV. To DRAW AN Inclined Line, given in Position and Magnitude 71 PROBLEM XVL To FIND THE Vanishing- Point of a given Inclined Line 75 PROBLEM XVII. To find the Dividing^Points of a given Inclined Line 78 PROBLEM XVIII. To find the Sight-Line op an Inclined Plane in which 1 wo LlNliS ARE given IN POSITION , . . .81 XU CONTENTS. PROBLEM XIX. Page To FIND THE VaNISHING-PoINT OF STEEPEST LiNES IN AN Inclined Plane whose Sight-Line is given . . 83 PROBLEM XX. To find the Vanishing-Point of Lines perpendiculae to the Surface of a given Inclined Plane . . 85 APPENDIX. L Practice ajh) Observations on the preceding Problems 97 IL Demonstrations which could not conveniently be in- cluded in the Text 135 THE ELEMENTS. INTRODUCTION. When you begin to read this book, sit down very near the window, and shut the window. I hope the \dew out of it is pretty; but, whatever the view may be, we shall find enough in it for an illustration of the first principles of perspective (or, literally, of "look- ing through "). Every pane of your window may be considered, if you choose, as a glass picture ; and what you see through it, as painted on its surface. And if, holding your head still, you extend your hand to the glass, you may, with a brush full of any thick colour, trace, roughly, the lines of the land- scape on the glass. But, to do this, you must hold your head very still. Not only you must not move it sideways, nor up and down, but it must not even move backwards or forwards ; for, if you move your head forwards, you B 2 THE ELEMENTS OF PERSPECTIVE. will see more of the landscape through the pane ; and, if you move it backwards, you will see less: or considering the pane of glass as a picture, when you hold your head near it, the objects are painted small, and a great many of them go into a little space ; but, when you hold your head some distance back, the objects are painted lai'ger upon the pane, and fewer of them go into the field of it. But, besides holding your head still, you must, when you try to trace the picture on the glass, shut one of your eyes. If you do not, the point of the brush appears double ; and, on farther experiment, you will observe that each of your eyes sees the object in a different place on the glass, so that the tracing which is true to the sight of the right eye is a couple of inches (or more, according to your distance from the pane,) to the left of that which is true to the sight of the left. Thus, it is only possible to draw what you see through the window rightly on the surface of the glass, by fixing one eye at a given point, and neither moving it to the right nor left, nor up nor INTRODUCTION. 3 dowTi, nor backwards nor forwards. Every picture drawn in true perspective may be considered as an upright piece of glass*, on which the objects seen through it have been thus drawn. Perspective can, therefore, only be quite right, by being calculated for one fixed position of the eye of the observer; nor will it ever appear deceptively right unless seen precisely from the point it is calculated for. Custom, however, enables us to feel the rightness of the work on using both our eyes, and to be sa- tisfied with it, even when we stand at some distance from the point it is designed for. Supposing that, instead of a window, an unbroken plate of crystal extended itself to the right and left of you, and high in front, and that you had a brush as long as you wanted (a mile long, sup- pose), and could paint with such a brush, then the clouds high up, nearly over your head, and the landscape far away to the right and left, might * If the glass were not upright, but sloping, the objects might still be drawn through it, but their perspictive would then be different. Perspective, as commonly taught, is always calculated for a Tcrtical plane of picture. B 2 4 THE ELEMENTS OF PERSrECTIVE. be traced, and painted, on this enormous crystal field.* But if the field were so vast (suppose a mile high and a mile wide), certainly, after the picture was done, you would not stand as near to it, to see it, as you are now sitting near to your win- dow. In order to trace the upper clouds through your great glass, you would have had to stretch your neck quite back, and nobody likes to bend their neck back to see the top of a picture. So you would walk a long way back to see the great picture — a quarter of a mile, perhaps, — and then all the perspective would be wrong, and would look quite distorted, and you would discover that you ought to have painted it from the greater distance, if you meant to look at it from that distance. Thus, the distance at which you intend the observer to stand from a picture, and for which you calculate the perspective, ought to regulate to a certain degree the size of the picture. If you place the point of observation near the canvass, you should not make * Supposing it to have no thickness; otherwise the images would he. distorted by refraction. INTRODUCTION. § the picture very large : vice versa, if you place the point of observation far from the canvass, you should not make it very small ; the fixing, therefore, of this point of observation determines, as a matter of con- venience, within certain limits, the size of your picture. But it does not determine this size by any perspective law ; and it is a mistake made by many writers on perspective, to connect some of their rules definitely with the size of the picture. For, suppose that you had what you now see through your window painted actually upon its surface, it would be quite optional to cut out any piece you chose, with the piece of the landscape that was painted on it. You might have only half a pane, with a single tree; or a whole pane, with two trees and a cottage ; or two panes, with the whole farmyard and pond; or four panes, with farmyard, pond, and foreground. And any of these pieces, if the land- scape upon them were, as a scene, pleasantly com- posed, would be agreeable pictures, though of quite different sizes ; and yet they would be all calculated for the same distance of observation. 6 THE ELEMENTS OF PERSPECTIVE. In the following treatise, therefore, I keep the size of the picture entirely undetermined. I con- sider the field of canvass as wholly unlimited, and on that condition determine the perspective laws. After we know how to apply those laws without limitation, we shall see what limitations of the size of the picture their results may render ad- visable. But although the size of the picture is thus inde- pendent of the observer's distance, the size of the object represented in the picture is not. On the contrary, that size is fixed by absolute mathematical law ; that is to say, supposing you have to draw a tower a hundred feet high, and a quarter of a mile distant from you, the height which you ought to give that tower on your paper depends, with ma- thematical precision, on the distance at which you intend your paper to be placed. So, also, do all the rules for drawing the form of the tower, whatever it may be. Hence, the first thing to be done in beginning a drawinor is to fix, at your choice, this distance of INTRODUCTION. 7 observation, or the distance at which you mean to stand from your paper. After that is determined, all is determined, except only the ultimate size of your picture, which you may make greater, or less, not by altering the size of the things represented, but by taking in more, or fewer of them. So, then, before proceeding to apply any practical perspective rule, we must always have our distance of observa- tion marked, and the most convenient way of marking it is the following. PLACING OF THE SIGHT-POINT, SIGHT-LINE, SIATION- POINT, AND STATION-LINE. Vr A I N/' "\0 S P - o T R Fig. 1. b4 H D 8 THE ELEMENTS OF PEKSPECTIVE. I. The Sight-Point. — Let abcd, Fig. 1., be your sheet of paper, the larger the better, though per- haps we may cut out of it at last only a small piece for our picture, such as the dotted circle N o p Q. This circle is not intended to limit either the size or shape of our picture : you may ulti- mately have it round or oval, horizontal or upright, small, or large, as you choose. I only dot the line to give you an idea of whereabouts you will pro- bably like to have it; and, as the operations of perspective are more conveniently performed upon paper underneath the picture than above it, I put this conjectural circle at the top of the paper, about the middle of it, leaving plenty of paper on both sides and at the bottom. Now, as an observer generally stands near the middle of a picture to look at it, we had better at first, and for simpli- city's sake, fix the point of observation opposite the middle of our conjectural picture. So take the point s, the centre of the circle n o p Q ; — or, which will be simpler for you in your own work, take the point s at random near the top of your paper, and INTRODUCTION. 9 strike the circle n o p Q round it, any size you like. Then the point S is to represent the point opposite which you wish the observer of your picture to place his eye, in looking at it. Call this point the " Sight- Point." II. The Sight-Line. — Through the Sight-point, s, draw a horizontal line, G h, right across your paper from side to side, and call this line the "Sight- Line." This line is of great practical use, represent- ing the level of the eye of the observer all through the picture. You will find hereafter that if there is a horizon to be represented in your picture, as of distant sea or plain, this line defines it. TIL The Station-Line. — From s let fall a per- pendicular line, s R, to the bottom of the paper, and call this line the " Station-Line." This represents the line on which the observer stands, at a greater or less distance from the picture ; and it ought to be imagined as drawn right out from 10 THE ELEMENTS OF PERSPECTIVE. the paper at the point s. Hold your paper upright in front of you, and hold your pencil horizontally, with its point against the point s, as if you wanted to run it through the paper there, and the pencil will represent the direction in which the line s R ought to be drawn. But as all the measurements which we have to set upon this line, and operations which we have to perform with it, are just the same when it is drawn on the paper itself, below s, as they would be if it were represented by a wire in the position of the levelled pencil, and as they are much more easily performed when it is drawn on the paper, it is always in practice, so drawn. IV. The Station-Point. — On this Kne, mark the distance s t at your pleasure, for the distance at which you wish your picture to be seen, and call the point T the " Station-Point." In practice, it is generally advisable to make the distance s t about as great as the diameter of your intended picture ; and it should, for the most part, be more rather than less ; but, as I have just stated, this is INTRODUCTION. 11 quite arbitrary. However, in this figure, as an ap- proximation to a generally advisable distance, I make the distance s T equal to the diameter of the circle N p Q. Now, having fixed this distance, s T, all the dimensions of the objects in our picture are fixed likewise, and for this reason : — Let the upright line A b. Fig. 2,, represent a pane of glass placed where our picture is to be placed ; s Fig. 2. but seen at the side of it, edgeways; let s be the Sight-point; s T the Station-line, which, in this figure, observe, is in its true position, drawn out from the paper, not down upon it ; and t the Station-point. 12 THE ELEMENTS OF PERSPECTIVE. Suppose the Station-line s t to be continued, or in mathematical language "produced," through s, far beyond the pane of glass, and let p Q be a tower or other upright object situated on or above this line. Now the apparent height of the tower pq is measured by the angle Q T P, between the rays of light which come from the top and bottom of it to the eye of the observer. But the actual height of the image of the tower on the pane of glass A b, between us and it, is the distance p' q', between the points where the rays traverse the glass. Evidently, the farther from the point T we place the glass, making s T longer, the larger will be the image ; and the nearer we place it to t, the smaller the image, and that in a fixed ratio. Let the dis- tance D T be the direct distance from the Station- point to the foot of the object. Then, if we place the glass A b at one third of that whole distance, p' q' will be one third of the real height of the object; if we place the glass at two thirds of the distance, as INTEODUCTION. 13 at E F, p'' q''' (the height of the image at that point) will be two thirds the height * of the object, and so on. Therefore the mathematical law is that p' q' will be to p Q as s T to D T. I put this ratio clearly by itself that you may remember it : p' q' : p Q : : s T : D T or in words : p dash Q dash is to p Q as s T to d T In which formula, recollect that p' q' is the height of the appearance of the object on the picture ; p q the height of the object itself; s the Sight-point: T the Station-point; d a point at the direct distance of the object; though the object is seldom placed actually on the hue T s produced, and may be far to the right or left of it, the formula is still the same. For let s. Fig. 3., be the Sight-point, and A b the glass — here seen looking down on its wpjper edge, * I say " height " instead of " magnitude," for a reason stated in Appendix I., to which you will soon be referred. Read on here at present. 14 THE ELEMENTS OF PEESPECTIVE. not sideways ; — then if the tower (represented now, as on a map, by the dark square), instead of being at D on the line s T produced, be at e, to the right (or left) of the spectator, still the apparent height of the tower on A b will be as s' T to e t, which is the same ratio as that of s T to D T. Now in many perspective problems, the position of an object is more conveni- ently expressed by the two measurements n t and d e, Fig. 3. than by the single oblique measurement e t. I shall call d t the " direct distance " of the object at E, and d e its '' lateral distance." It is rather a license to call d t its " direct " distance, for e t is the more direct of the two ; but there is no other term which would not cause confusion. Lastly, in order to complete our knowledge of the position of an object, the vertical height of some INTEODUCTION. 15 point in it, above or below the eye, must be given ; that is to say, either d p or d q in Fig. 2. * : this I shall call the '^ vertical dista>nce " of the point given. In all perspective problems these three distances, and the dimensions of the object, must be stated, other- wise the problem is imperfectly given. It ought not to be required of us merely to draw a room or a church in perspective ; but to draw this room from ^Jiis corner, and that church on that spot, in per- spective. For want of knowing how to base their drawings on the measurement and place of the object, I have known practised students represent a parish church, certainly in true perspective, but with a nave about two miles and a half long. It is true that in drawing landscapes from natiure the sizes and distances of the objects cannot be accu- rately known. When, however, we know how to draw them rightly, if their size were given, we have only to assume a rational approximation to their * p and Q being points indicative of the place of the tower's base and top. In this figure both are above the sight-line ; if the tower were below the spectator both would be below it, and therefore measured below d. 16 THE ELEMENTS OF PERSPECTIVE. size, and the resulting drawing will be true enough for all intents and purposes. It does not in the least matter that we represent a distant cottage as eighteen feet long, when it is in reality only seventeen ; but it matters much that we do not represent it as eighty feet long, as we easil}?^ might if we had not been accustomed to draw from measurement. There- fore, in all the following problems the measurement of the object is given. The student must observe, however, that in order to bring the diagrams into convenient compass, the measurements assumed are generally very different from any likely to occur in practice. Thus, in Fig. 3., the distance d s would be probably in practice half a mile or a mile, and the distance T s, from the eye of the observer to the paper, only two or three feet. The mathematical law is however precisely the same, whatever the proportions ; and I use such pro- portions as are best calculated to make the diagi-am clear. Now, therefore, the conditions of a perspective problem are the following : INTEODUCTION. 17 J 3 1 The Sight-line an given, Fig. 1. ; j The Sight-point s given ; The Station-point T given ; and ^ The three distances of the ohject*, direct, late- ral, and vertical, with its dimensions, given. ^ The size of the picture, conjecturally limited by \ the dotted circle, is to be determined afterwards at i our pleasure. On these conditions I proceed at ; once to construction. I * More accurately, " the three distances of any point, either in the ' object itself, or indicative of its distance." i 18 THE ELEMENTS OF PERSPECTIVE. PROBLEM L TO FIX THE POSITION OF A GIYEN POINT. Fig. 4. Let p, Fig. 4., be the given point. Let its direct distance be d T ; its lateral distance to the left, D c ; and vertical distance beneath the eye of the observer, c p. * More accurately, " To fix on the plane of the picture the appa- rent position of a point given in actual position." In the headings of all the following problems the words " on the plane of the picture " TO FIX THE POSITION OF A GIVEN POINT. 19 [Let G H be the Sight-line, s the Sight-point, and T the Station-point.] * It is required to fix on the plane of the picture the position of the point P. Arrange the three distances of the object on your paper, as in Fig. 4. f Join c T, cutting g h in q. From Q let fall the vertical line q p'. Join p T, cutting Q p in p^ p' is the point required. are to be understood after the words " to draw." The plane of the picture means a surface extended indefinitely in the direction of the picture. * The sentence within brackets will not be repeated in succeed- ing statements of problems. It is always to be understood. f In order to be able to do this, you must assume the distances to be small ; as in the case of some object on the table : how large distances are to be treated you will see presently ; the mathe- matical principle, being the same for all, is best illustrated first on a small scale. Suppose, for instance, p to be the corner of a book on the table, seven inches below the eye, five inches to the left of it, and a foot and a half in advance of it, and that you mean to hold your finished drawing at six inches from the eye; then t s will be six inches, t d a foot and a half, d c five inches, and c p seven. c 2 20 THE ELEMENTS OF PEKSPECTITE. If the point p is above the eye of the observer instead of below it, c P is to be measured upwards Fig. 5. from c, and Q p' drawn upwards from q. The con- struction will be as in Fig. 5. And if the point P is to the right instead of the left of the observer, d c is to be measured to the right instead of the left. TO FIX THE POSITION OF A GIVEN POINT. 21 The figures 4. and 5., looked at in a mirror, will show the construction of each, on that supposition. Now read very carefully the examples and notes to this problem in Appendix I. (page 97.). I have put them in the Appendix in order to keep the sequence of following problems more clearly trace- able here in the text; but you must read the fii'st Appendix before going on. C 3 22 THE ELEMENTS OF EEESPECTIVE. PROBLEM II. TO DRAW A EIGHT LINE BETWEEN TWO GIYEN POINTS. a D' Fig. 6. Let a b, Fig. 6., be the given right line, joining the given points A and b. Let the direct, lateral, and vertical distances of the point A be t d, d c, and c A. RIGHT LINE BETWEEN GIVEN POINTS. 23 Let the direct, lateral, and vertical distances of the point b be t d', d c', and c' b. Then, by Problem I., the position of the point A on the plane of the picture is a. And similarly, the position of the point B on the plane of the picture is 6. Join a h. Then a 6 is the line required. COROLLARY L If the line a b is in a plane parallel to that of the picture, one end of the line A b must be at the same direct distance from the eye of the observer as the other. Therefore, in that case, d t is equal to d' t. Then the construction will be as in Fig. 7.; and the student will find experimentally that a 6 is now parallel to A B.* * For by the construction at : ailiBT: 6t; and there- fore the two triangles ab t, abi, (having a common angle ai^b,) are similar. C 4 24 THE ELEMENTS OF PERSPECTIVE. And that a 6 is to A b as t s is to t d. C C D Fig. 7. Therefore, to draw any line in a plane parallel to that of the picture, we have only to fix the position of one of its extremities, a or 6, and then to draw from a or 6 a line parallel to the given line, bearing the proportion to it that T s bears to t d. RIGHT LINE IN HORIZONTAL PLANE. 25 COEOLLARY II. If the line A b is in a horizontal plane, the vertical distance of one of its extremities must be the same as that of the other. Therefore, in that case, A c equals B c' (Fig. 6.). And the construction is as in Fig. 8. Eig. 8. In Fig. 8. produce a 6 to the sight-line, cutting the sight-line in v; the point v, thus determined, is called the Vanishing-Point of the line A b. 26 THE ELEMENTS OF PERSPECTIVE. Join T V. Then the student will find experi- mentally that T V is parallel to A b.* COEOLLAEY III. If the line a b produced would pass through some point beneath or above the station-point, c d is to D T as c' d' is to d' T ; in which case the point c coincides with the point cf, and the line a 6 is vertical. Therefore every vertical line in a picture is, or may be, the perspective representation of a ho- rizontal one which, produced, would pass beneath the feet or above the head of the spectator.! * The demonstration is in Appendix 11. Article I. t The reflection in water of any luminous point or isolated object (such as the sun or moon) is therefore, in perspective, a vertical line; since such reflection, if produced, would pass under the feet of the spectator. Many artists (Claude among the rest) knowing some- thing of optics, but nothing of perspective, have been led occasion- ally to draw such reflections towards a point at the centre of the base of the picture. VANISHING-POINT OF HORIZONTAL LINES. 27 PROBLEM III. TO FIND THE YANISHING-POINT OF A GIYEN HORIZONTAL LINE. Fig. 9. Let a b. Fig. 9., be the given line. From T, the station-point, draw TV parallel to A B, cutting the sight-line in v. V is the Vanishing-point required.* * The student will observe, in practice, that, his paper lying flat on the table, he has only to draw the line t v on its horizontal sur- face, parallel to the given horizontal line A b. In theory, the paper 28 THE ELEMENTS OF PERSPECTIVE. COEOLLAKY I. As, if the point b is first found, v may be deter- mined by it, so, if the point v is first found, b may should be vertical, but the station-line s t horizontal (see its defini- tion above, page 10.) ; in which case t v, being drawn parallel to A B, will be horizontal also, and still cut the sight-line in v. The construction will be seen to be founded on the second Corol- lary of the preceding problem. It is evident that if any other line, as m n in Fig. 9., parallel to A B, occurs in the picture, the line t v, drawn from t, parallel to M N, to find the vanishing-point of m n, will coincide with the line drawn from t, parallel to a b, to find the vanishing-point of ab. Therefore a b and m n will have the same vanishing-point. Therefore all parallel horizontal lines have the same vanishing- point. It will be shown hereafter that all parallel inclined lines also have the same vanishing-point; the student may here accept the general conclusion — ^^ All parallel lines have the same vanishing- point.'' It is also evident that if a b is parallel to the plane of the picture , TV must be drawn parallel to gh, and will therefore never cut gh. The line a b has in that case no vanishing-point : it is to be drawn by the construction given in Fig. 7. It is also evident that if a b is at right angles with the plane of the picture, t v will coincide with t s, and the vanishing-point of A B will be the sight-point. RIGHT LINE IN HORIZONTAL PLANE. 29 be determined by it. For let ab. Fig. 10., be the given line, constructed upon the paper as in Fig. 8. ; and let it be required to draw the line a h without using the point c'. Find the position of the point A in a. (Pro- blem I.) Find the vanishing-point of A b in v. (Problem III.) 30 THE ELEMENTS OF PERSPECTIVE. Join a V. Join B T, cutting a y in b. Then a 6 is the line required.* COKOLLAEY II. We have hitherto proceeded on the supposition that the given line was small enough, and near enough, to be actually drawn on our paper of its real size ; as in the example given in Appendix I. We may, however, now deduce a construction available under all cir- cumstances, whatever may be the distance and length of the line given. From Fig. 8. remove, for the sake of clearness, the lines c' d', b v, and t v ; and, taking the figure as here in Fig. 11., draw from a, the line a R parallel to A B, cutting B T in R. * I spare the student the formality of the reductio ad absurdum, which would be necessary to prove this. RIGHT LINE IN HOEIZONTAL PLANE. 31 Fig. 11. Then a r is to A b as a t is to a t. — — as c T is to c T. — — as T s is to T D. That is to say, a R is the sight-magnitude of AB. * For definition of Sight- Magnitude, see Appendix I. It ought to have been read before the student comes to this problem ; but I refer to it in case it has not. 32 THE ELEMENTS OF PERSPECTIVE. Therefore, when the position of the point A is fixed in a, as in Fig. 12., and a v is drawn to the B vanishing-point; if we draw a line a r from a, parallel to A b, and make a R equal to the sight- magnitude of A B, and then join r t, the line R T will cut a V in 6. So that, in order to determine the length of a b, we need not draw the long and distant line A b, but RIGHT LINE IN HORIZONTAL PLANE. 33 only a E parallel to it, and of its sight-magnitude ; which is a great gain, for the line A b may be two miles long, and the line a r perhaps only two inches. COKOLLARY III. In Fig. 12., altering its proportions a little for the sake of clearness, and putting it as here in Fig. 13., Fig. 13. draw a horizontal line a r' and make a r' equal to OtR. Through the points r and h draw r' m, cutting the 34 THE ELEMENTS OF PERSPECTIVE. sight-line in M. Join t v. Now the reader will find experimentally that v m is equal to v T.* Hence it follows that, if from the vanishing-point V we lay off on the sight-line a distance, v M, equal to v t; then draw through a a horizontal line a R^ make a r' equal to the sight-magnitude of A B, and join r' m; the line r' m will cut a v in 6. And this is in practice generally the most convenient way of obtaining the length of a 6. COEOLLAEY IV. Eemoving from the preceding figure the unneces- sary lines, and retaining only r'm and a\, as in Fig. 14., produce the line a r' to the other side of a, and make a x equal to a r'. Join X h, and produce x 6 to cut the line of sight in N. Then as x r' is parallel to M N, and a r' is equal to a X, V N must, by similar triangles, be equal to v M (equal to v T in Fig. 13.). * The demonstration is in Appendix II. Article II. p. 137. DIVIDING POINTS. 35 Therefore, on whichever side of v we measure the distance v T, so as to obtain either the point M, or the point N, if we measure the sight-magnitude a r' or a X on the opposite side of the line a v, the line joining r' m or x n will equally cut a v in 6. Fig. 14. The points m and n are called the "Dividing- Points" of the original line AB (Fig. 12.), and we resume the results of these corollaries in the fol- lowing three problems. i> 2 36 THE ELEMENTS OF PEESPECTIVE. PROBLEM IV. TO FIND THE DIVIDING-POINTS OF A GIVEN HORIZONTAL LINE. Fi^. 15. Let the horizontal line ab (Fig. 15.) be given in position and magnitude. It is required to find its dividing-points. Find the vanishing-point v of the line A b. With centre v and distance v t, describe circle cutting the sight-line in m and N. Then M and N are the dividing-points required. In general, only one dividing-point is needed for use with any vanishing-point, namely, the one nearest s (in this case the point m). But its op- posite N, or both, may be needed under certain cir- cumstances. GITBN LINE IN HOKIZONTAL PLANE. 37 PROBLEM y. TO DRAW A HORIZONTAL LINE, GIVEN IN POSITION AND MAGNITUDE, BY MEANS OF ITS SIGHT-MAGNITUDE AND DIVIDING- POINTS. B iig. 16. Let ab (Fig. 16.) be the given line. Find the position of the point A in a. Find the vanishing-point v, and most convenient dividing-point M, of the line A b. Join a V. Through a draw a horizontal line a h' and make a h' equal to the sight-magnitude of A ^. Join h' M, cutting a V in 6. Then a 6 is the line required. » 3 38 THE ELEMENTS OF PERSPECTIVE. Fig V7 Supposing it were now required to draw a line A c (Fig. 17.) twice as long as A b, it is evident that the sight-magnitude a d must be twice as long as the sight-magnitude a h' ; we have, therefore, merely to continue the horizontal line a b% make h' d equal to a h'y join c m', cutting a v in c, and a c will be the line required. Similarly, if we have to draw a line A D, GIYEN LINE IN HORIZONTAL PLANE. 39 three times the length of ab, adf must be three times the length of a h\ and, joining dfu, ad will be the line required. The student will observe that the neai'er the por- tions cut off, he, cdf &c., approach the point v, the smaller they become ; and, whatever lengths may be added to the line A d, and successively cut off from a V, the line a v will never be cut off entirely, but the portions cut off will become infinitely small, and apparently "vanish" as they approach the point v; hence this point is called the " vanishing " point COEOLLARY II. It is evident that if the line A d had been given ori- ginally, and we had been required to draw it, and divide it into three equal parts, we should have had only to divide its sight-magnitude, a d\ into the three equal parts, a If, h' d, and c d', and then, drawing to m from y and . \ A \ » V>» \ \ » \ \\\\ » \ ^ » V *» \ .v«\\ \ a\ < >\«1 \\\ \'\'« V A /'''W \\ V v\\ \\\ ^^ Q 130 PKACTICE AND OBSEKVATIONS [App. I. Thus, let A BCD, Fig. 73., be a rectangular inclined plane, and let it be required to find the vanishing-point of its diagonal b d. B Fig. 73. Find V, the vanishing-point of a d and b c. Draw A E to the opposite vanishing-point, so that D a E may represent a right angle. Let fall from b the vertical b e, cutting a e in E. Join e d, and produce it to cut the sight-line in v'. Then, since the point e is vertically imder the point b, the horizontal line e d is vertically under the inclined line b d. So that if we now let fall the vertical v' p Prob. XVL] ON THE PRECEDING PROBLEMS. 131 from v', and produce b d to cut v' P in p, the point p will be the vanishing-point of b d, and of all lines parallel to it.* * The student may perhaps understand this construction better by completing the rectangle a d f e, drawing d f to the vanishing- point of A E, and E F to V. The whole figure, b f, may then be conceived as representing half the gable roof of a house, a f the rectangle of its base, and a c the rectangle of its sloping side. In nearly all picturesque buildings, especially on the Continent, the slopes of gables are much varied (frequently unequal on the two sides), and the vanishing-points of their inclined lines become very important, if accuracy is required in the intersections of tiling, sides of dormer windows, &c. Obviously, also, irregular triangles and polygons in vertical planes may be more easily constructed by finding the vanishing-points of their sides, than by the construction given in the corollary to Pro- blem IX. ; and if such triangles or polygons have others concen- trically inscribed within them, as often in Byzantine mosaics, &c., the use of the vanishing-points will become essential. K 2 132 PRACTICE AND OBSERVATIONS [App. I. PROBLEM XVIII. Before examining the last three problems it is necessary that you should understand accurately what is meant by the position of an inclined plane. Cut a piece of strong white pasteboard into any irregular shape, and dip it in a sloped position into water. However you hold it, the edge of the water, of course, will always draw a horizontal line across its surface. The direction of this horizontal line is the direction of the inclined plane. (In beds of rock geologists call it their " strike.") Next, draw a semicircle on the piece of pasteboard ; draw its diameter, ab, Fig. 74., and a vertical line from its centre, c d ; and draw some other lines, c E, c f, &c., from the centre to any points in the circumference. Now dip the piece of pasteboard again into water, and, Prob. XV III-] ON THE PRECEDINa PROBLEMS. 133 holding it at any inclination and in any direction you choose, bring the surface of the water to the line a b. Then the line c d will be the most steeply inclined of all the lines dra^vn to the circumference of the circle ; G c and H c will be less steep ; and e c and f c less steep still. The nearer the lines to c d, the steeper they will be ; and the nearer to a b, the more nearly horizontal. When, therefore, the line a b is horizontal (or marks the water surface), its direction is the direction of the inclined plane, and the inclination of the line d c is the inclination of the inclined plane. In beds of rock geolo- gists call the inclination of the line dc their " dip." To fix the position of an inclined plane, therefore, is to determine the direction of any two lines in the plane, a b and c D, of which one shall be horizontal and the other at right angles to it. Then any lines drawn in the inclined plane, parallel to a b, will be horizontal ; and lines drawn parallel to c d will be as steep as c d, and are spoken of in the text as the " steepest lines " in the plane. But farther, whatever the direction of a plane may be, if it be extended indefinitely, it will be terminated, to the eye of the observer, by a boundary line, which, in a hori- zontal plane, is horizontal (coinciding nearly with the visible horizon) ; — in a vertical plane, is vertical ; — and, in an inclined plane, is inclined. This line is properly, in each case, called the " sight-line" of such plane ; but it is only properly called the " horizon " in the case of a horizontal plane : and I have preferred K 3 134 PRACTICE AND OBSERVATIONS. [App. I. using always the term " sight-line," not only because more comprehensive, but more accurate ; for though the curva- ture of the earth's surface is so slight that practically its visible limit always coincides with the sight-Hne of a horizontal plane, it does not mathematically coincide with it, and the two lines ought not to be considered as theo- retically identical, though they are so in practice. It is evident that all vanishing-points of lines in any plane must be found on its sight-line, and, therefore, that the sight-line of any plane may be found by joining any two of such vanishing-points. Hence the construction of Problem XVIII. 11. DEMONSTRATIONS WHICH COULD NOT CONVE- NIENTLY BE INCLUDED IN THE TEXT, THE SECOND COROLLARY, PROBLEM IL In Fig. 8. omit the lines c d, c' d', and d s ; and, as here in Fig. 75., from a draw a d parallel to a b, cutting b t m d ; and from d draw d e parallel to b c. Fiff. 75. k4 136 ADDITIONAL DEMONSTRATIONS. [App. II. Now as 0? ^ is parallel to a b — AC : ac 11 BC : de; but A c is equal to b c' — /, ac = de, Now because the triangles acv, bc'v, are similar — a c I be' II ay : by; and because the triangles der, be' t are similar — de I be' 11 dr : bT. But « c is equal to 6? e — /. ay I by :: dT I bT; ,•« the two triangles a b d, 5 t v, are similar, and their angles are alternate ; /, T V is parallel to a d. But a c? is parallel to a b — ,% T V is parallel to a b. Prob. III.] ADDITIONAL DEMONSTRATIONS. 137 11. THE THIRD COROLLARY, PROBLEM III. In Fig. 13., since an is by construction parallel to a b in Fig. 12., and t v is by construction in Problem III. also parallel to a b — /, a R is parallel to t v, .'. abR and t J v are alternate triangles, ,\ an I TV :: ab : by. Again, by the construction of Fig. 13., an' is parallel to MV — .*, abR' and m 5 v are alternate triangles, /, an' : MY 11 ab I by. And it has just been shown that also aR : Ty y, ab : by — /. a r' ; M V : : a R : TV. But by construction, a r' = aR — .*. M V = T V. 138 ADDITIONAL DEMONSTRATIONS. [App. II. III. ANALYSIS OF PROBLEM XV. We proceed to take up the general condition of the second problem, before left unexamined, namely, that in which the vertical distances bc' and AC (Fig. 6. page 22.), as well as the direct distances t d and t d' are unequal. In Fig. 6., here repeated (Fig. 76.), produce c' b down- wards, and make c' e equal to c A. C D' Prob. XV.] ADDITIONAL DEMONSTRATIONS. 139 Join A E. Then, by the second Corollary of Problem II., ae is a horizontal line. Draw T V parallel to a e, cutting the sight-line in v. /, V is the vanishing-point of a e. Complete the constructions of Problem II. and its second CoroUary. Then by Problem II. ab is the line a b drawn in perspective ; and by its Corollary a e is the line a e drawn in perspective. From V erect perpendicular v p, and produce ab to cut it in p. Join TP, and from e draw e/ parallel to a e, and cutting A Tin/. Now in triangles e b t and a e t, as eb is parallel to e b and e/ to a e ; — eb ', efH eb I ae. But T V is also parallel to a e and ty to eb. Therefore also in the triangles a p v and « v t, eb l efllFV I YT. Therefore pv;vt::eb;ae. And, by construction, angle tpv=:Z.aeb. Therefore the triangles t v p, a e b, are similar; and T p is parallel to a b. Now the construction in this problem is entirely general for any inclined line a b, and a horizontal line a e in the same vertical plane with it. 140 ADDITIONAL DEMONSTRATIONS. [App. II. So that if we find the vanishing-point of a e in v, and from V erect a vertical v P, and from t draw t p parallel to A B, cutting V p in p, p will be the vanishing-point of AB, and (by the same proof as that given at page 27.) of all lines parallel to it. Next, to find the dividing-point of the inclined line. I remove some unnecessary lines from the last figure and repeat it here, Fig. 77., adding the measuring-line Fig. 77. a M, that the student may observe its position -with respect to the other lines before I remove any more of them. Pkob. XV.] ADDITIONAL DEMONSTEATIONS. 141 Now if the line a b in this diagram represented the length of the line A b in reality (as a b does in Figs. 10. and 11.), we should only have to proceed to modify Corollary III. of Problem II. to this new construction. We shall see presently that a b does not represent the actual length of the inclined line a b in nature, neverthe- less we shall first proceed as if it did, and modify our result afterwards. In Fig. 77. draw a d parallel to a b, cutting b t in J. Therefore a c? is the sight-magnitude of a b, as a r is of A B in Fig. 11. Remove again from the figure all lines except P v, v T, p T, ah, ad, and the measuring-line. Fig. 78. * Set off on the measuring-Hne a m equal to a d. 142 ADDITIONAL DEMONSTRATIONS. [App. II. Draw p Q parallel to a m, and through h draw m q, cutting p Q in Q. Then, by the proof already given in page 32., p q=p t. Therefore if p is the vanishing-point of an inclined line A B, and Q p is a horizontal line drawn through it, make p Q equal to p t, and a m on the measuring-line equal to the sight-magnitude of the line a b in the diagram^ and the line joining m q will cut « p in ^. We have now, therefore, to consider what relation the length of the line a b in this diagram, Fig. 77., has to the length of the line a b in reality. Now the line a e in Fig. 77. represents the length of a E in reality. But the angle a e b, Fig. 77., and the corresponding angle in all the constructions of the earlier problems, is in reality a right angle, though in the diagram necessarily represented as obtuse. Therefore, if from e we draw e c, as in Fig. 79., at B right angles to a e, make e c=e b, and join a c, A c will be the real length of the line a b. E Now, therefore, if instead of a m in Fig. 78., we take the real length of T,. ^„ A B, that real length will be to a m as Fig. 79. ' ^ A c to A B in Fig. 79. And then, if the line drawn to the measuring-line p Q is still to cut a p in h, it is evident that the line p q must Prob. XV.] ADDITIONAL DEMONSTBATIONS. 143 be shortened in the same ratio that a m was shortened ; and the true dividing-point will be q' in Fig. 80., fixed so that q' p' shall be to Q p as « m' is to a m ; am' repre- senting the real length of a b. But a m' is therefore to a w as a c is to a b in Fig. 79. Therefore p q' must be to p q as a c is to a b. But p Q equals p t (Fig. 78.) ; and p v is to v T (in Fig. 78.) as BE is to A E (Fig. 79.). Hence we have only to substitute p v for e c, and v t for A E, in Fig. 79., and the resulting diagonal a c will be the required length of p q'. It will be seen that the construction given in the text (Fig. 46.) is the simplest means of obtaining this mag- nitude, for V D in Fig. 46. (or v m in Fig. 15.) = v t by construction in Problem FV. It should, however, be observed, that the distance p q' or p x, in Fig. 46., may 144 ADDITIONAL DEMONSTRATIONS. 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