IMAGE EVALUATION TEST TARGET (MT.3) 4r y. ^ 1.0 I.I 1.25 ■- IIIIM 1 4.0 wuu M M 1.8 1.4 III 1.6 6" V] <^ /2 P«8 O^i ^m G'^^' /A Photograpnic Sciences Corporation 23 WEST MAIN STREET WEBSTER, NY. 14580 (716) 872-4503 4' 4^ ^ k <^ *% V »^. '^y > ~-^MJ ■ '^ i?.r / !^ ^^ :\ m % CIHM/ICMH Microfiche Series. CIHM/ICMH Collection de microfiches. Canadian Institute for Historical Microreproductions / institut Canadian de microreproductions historiquas r&icift7 Technical and Bibliographic Notes/Notes tecnniques at bibliographiques The Institute has attempted to obtain the best original copy 2vailahle for filming. Features of this copy which may be bibliographicaliy unique, which may alter any of the images in the reproduction, or which may significantly change the usual method of filming, are checked below. D D D D D n n Coloured covers/ Couverture de couleur Covers damaged/ Couverture endommagee Covers restored and/or laminated/ Couverture restaurie et/ou pelliculde Cover title missing/ Le titre de couvertute manque Coloured maps/ Cartes giographiques en couleur Coloured ink (i.e. other than blue or black)/ Encre de couleur (i.e. autre que bleue ou noire) I I Coloured platas and/or illustrations/ Planches et/ou illustrations en couleur Bound with other material/ Relit avec d'autres documents Tight binding may causa shadows or distortion along interior margin/ La re liure serree peut causer de I'ombre ou de la distorsion le long de la marge intirieure Blank leaves added during restoration may appear within the text. Whenever poss'ble. these have been omitted from filming/ il se peut que certaines pages blanches ajouties lors dune restauration apparaissent dans le texte, mais, lorsque cela Stait possible, ces pages n'ont pas iti film(ies. L'Institut a microfilm^ le meilleur exemplaire qu'il lui a iti possible de se procurer. Les details de cet exemplaire qui sont peut-dtre uniques du point de vue bibliographique, qui peuvent modifier une image reproduite. ou qui peuvent oxiger une modification dans la m^thode normale de filmage sont indiqu^s ci-dessous. I I Coloured pages/ Pages de couleur Pages damaged/ Pages endommagtes □ Pages restored and/or laminated/ Pages restaur^es et/ou pellicul^es Pages discoloured, stained or foxad/ ! Pages d^color^es, tachet^es ou piquees I I Pages detached/ Pages d^tachees Showthrough/ Transparence Quality of prir Qual'tti inigale de I'impression Includes supplementary materia Comprend du materiel supplementaire Only edition available/ Seule ddilion disponible r~5 Showthrough/ I I Quality of print varies/ r~| Includes supplementary material/ nn Only edition available/ □ Pages wholly or partially obscured by errata slips, tissues, etc., have been refilmed to ensure the best possible image/ Les pages totalement ou partiellement obscurcies par un feuillet d'errata. une pelure, etc., cnt ^t^ fiim^es i nouveau de facon i obtenir la meilleure image possible. Additional comments:/ Commentaires suppltmentaitjs; [Printed ephemera] 1 sheet (verso blank) This item is filmed at the reduction ratio checked below/ Ce document est fUmi au taux de reduction indiqui ci-dessous. 10X 14X 18X 22X 76X 30X —] 12X 16X 20X 24X 28X 32X The copy filmed hare has been reproduced thanks to the generosity of: D. B. Weldon Library University of Western Ontario (Regional History Room) The images appearing here are the best quality possible considering the condition and legibility of the original copy and in keeping with the filming contract specifications. L'exemplaire filmi fut reproduit grdce i la g^n^rositi de: D. B. Weldon Library University of Wbstorn Ontario (Regional History Room) Les images suivantes ont 6x6 reproduites avec le plu« grand soin. compte tenu de la condition et de la netteti de l'exemplaire filmi, et an conformity avec les conditions du contrat de filmage. Original copies in printed paper covers are filmed beginning with the front cover and ending on the last page with a printed or illjstrated impres- sion, or the back cover when appropriate. All other original copies are filmed beginning on the first page with a printed or illustrated impres- sion, and ending on the last page with a printed or illustrated impression. The last recorded frame on each microfiche shall contain the symbol —»•( meaning "CON- TINUED"), or the .-.ymbol V (meaning "END"), whichever applies. Lea exemplaires ori^inaux d<'>nt la couverture en papier est imprim^ sont filmis er commenpant par le premier plat et en terminant soit par la derniAre page qui comporte une ampreinte d'impression ou d'illustration, soit par le second plat, salon le caa. Tous lee autres exemplaires originaux sont filmds an commenpant par la premiere page qui comporte une ampreinte d'impression ou d'illustration at en terminant par la dernidre page qui comporte une telle empreinte. Un des symboies suivants apparaitra sur la derniire image de cheque microfiche, selon le cas: le symbole —^signifie "A SUIVRE", le symbols V signifie "FIN". Maps, plates, charts, etc., may be filmed at different reduction ratios. Those too large to be entirely included in one exposure are filmed beginning in the upper left hand corner, left to right and top to bottom, as many frames as required. The following diagrams illustrate the method: Les cartes, planches, tableaux, etc., peuvent dtre filmte 6 des taux de reduction diffdrents. Lorsque le document est t. op grand pour dtre reproduit en un seui cliche, il est filmd A partir de I'angle supdrieur gauche, de gauche d droite, et de haut en bas, en prenant le nombre d'images n^cessaire. Laa diagrammes suivants iilustrant la r.idthode. 1 2 3 1 2 3 4 5 6 I^cniictt OlolUgiate institute. WEEKLY EXAMINATIONS. PHYSICS. Forms I., II and III. 1. Describe clearly the conditions affecting the pitch of sound, with an experiment to prove the effect of each condition. 2. (a) Under what circumstances will an echo be heard at the point at which the sound is produced ? (A) Distinguish clearly between echoes and resonance. 3. (a) Show by a diagram what is meant by the interruption of sound waves, and how the effect is produced, (b) Distin- guish noise from music. 4. (a) Show why an image is formed when light passes through a small aperture, (b) Show by diagram the nature and po- sition of images produced by plane mirrors. 5. (a) Under what circumstances are invei ted images produced by concave mirrors ? Prove your answer by diagrams, {b) Draw to the eye the rays showing to a person his image, when he is close to a concave mirror. 6. (a) State and describe experim-^nts to p rove tb ^ Iftws of refraction of light, (b) Explain, wit]ik4iicM9f'lMi|mm, the difference between the real 9 nd the apparent depth of water, viewed obliquely, (c) Explain with diagram the structure of the compound microscope.