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Les diagrammes suivants iilustrent la mithode. ,. f 2 3 1 2 3 4 5 6 f^. ^^^zoW.. 1 1 i\ «n '-t-'-^*' \^ ...:-f/''> .' k DESCRIPTION AND LIST \l .^ -.. It ^ i \ I~M I OT THB LIGHTHOUSES OF THE WORLD. 1861. BY ALEXANDER a. FINDLAY, Fdloto of the Boyai Geographiedl Society, Ivv LONDON: printed by and for richard holmes laurie, 63, fleet street, e.o. julyTiwi. 521 Thk Introd read before have been | by drawing it would be •-'■-'•-■^^■■-^^^•W The varic nature of 1 not been to^ and Thoma which will Besides t the Select ( the Royal < subject of t] upon almoff the United Engineers < and require The lists Ibv the Adn [Dunsterv] In order llatest infon ccurred di lirected. London, Ji P R E F A C E. The Introductory portion of this Book is the substance of two Papers, by tlic Author, read before the Society of Arts on December 15, 1847, and March 3, 1858; which have been published in the Society's Transactions and Journal. It was thought, that by drawing the Sailor's attention to the methods by which the Lights are produced, it would be adding much to their utility, and prove interesting to many. The varied features of the beautiful Systems in operation are necessarily, from the nature of this Work, very briefly adverted to; and many important topics have not been touched upon for the same reason. The excellent worlfs of Robert, Alan, and Thomas Stevenson, will ftimish the reader with a fond of varied inforn^atipi^, which will supply all deficiencies in this, should a further insight be desired. Besides these works, and others of earlier date, quoted herein, the bulky Repbrte of the Select Committees of the House of Commons, of 1822, 1834, and 1845, and that of the Royal Commission published in the present year, if they have not advanced the subject of their inquiry, have collected and recorded a vast mass of detail bearing upon almost every relation of the Lighthouse System. Besides these, the Report of the United States' Lighthouse Board, in 1852, the works of Fresnel, and other Engineers of the French Commission, will give an excellent account of the condition and requirements of Lighthouses. The lists of the Lights which follow have been re-arrangcd from those published by the Admiralty, which, under the careftU superintendence of Commander Edward DuNSTERViLLE, R.N., have attained a'completeness approaching perfection. In order that this "Work may preserve its utility for several years, by giving the latest information, a Supplement, containing the additions and changes that have occurred during the previous year, will be annually forwai'ded on application as jdirccted. A. G. F. London, July 1, 1861. 190408 ADDENDA. Pharo Page 38 — Thb Buallb. The new Lighthouse is now completed; shows a bright fixe I light at 125 feet, from Aug. 1, 1861. Page 38 — Skbbrieb. A red ray from the Lighthouse is shown toward the Coal Book, Page 41 — ^Landouakd Point. The light is now shown from a tower on the Point. June 10, 1861. Pago 41 — OvTBR Dowsma. A Lightvessel, to show a quick revolving red light, will be moored at the west side about Oct. 1, 1861. Page 51 — BuNDALK. The Beacons from the Bar to the Quay have been lighted since AprU 1, 1861. Page 52 — Lovoh Foyle. A red lantern light, at 130 feet, on the Warren Point below Green Castle. Page 81 — CouvNA. The light on San Antonio Castle shown since May 15, 1861. Page 102 — ^Algoa Bay. A fixed light from a tower near the Donkin monument, Port Elizabeth, visible from N.W. to S.W. : the light for one point at each end of the arc will be red, the remaining six points white. June 1, 1861. Page 103 — Perm Island. Light bright, revolving in 4 minutes, (fixed and flashing ?) at 241 feet, visible 22 miles off. Shown since April 1, 1861. Early I Lightho Cord de hoi lighthi OUfl 1. Lig 10,1 or IM 2. Cat< Curv Smit 18; ; CONTENTS. bright fixel Coal Rock, Point. Juno ! light, -willbe \ lighted since n Point below rAoi Pharologyi or, a Desoription of Lighthouses and their lUummation 1 CHAPTER I. Early History of Lighthouses ^ 1 CHAPTER n. Lighthouses and Lightvessels .• 2 Cordouan Light, 2 ; Eddystone, Bell Rock, Skerrjrvore, Carlingford, and H^haux de Br6hat Lighthouses, 3 ; Force of Waves, 4 ; Mitchell's Screw Pile Light- house, 4, 5 j Iron Lighthouses, 6 ; Lightvesselfl, 7, 8 ; Beacons and Buoys, 8, 9. 861. inument. Port t at each end 1861. L flashing?) at CHAPTER III. Lighthouse Illumination 9 1. Lights. Wood and Coal Fires, 9; Argand and Fresnel's Lamps, 10; Oils, 10, 11 ; Dnunmond, or Lime Light, 11, 12 ; Bude, or Gumey Light, 12 ; Electric, or Magnetic Light, 12, 13. 2. Catoptric, or Reflector System, 13; Early uses, 13; Principles uf the Parabolic Curve, 13, 14; Earliest use, 15 ; Hutchinson's Reflectors, 15, 16; Teul&re's and Smith's Reflectors, 16 ; Characteristics of Reflectors, 17 ; Lightvessel Apparatus, 18 ; Bordier Marcet Apparatus, 18. 3. Dioptric or Lens System, 19 ; Rogers's, Buffon's, Sir D. Brewster's Lenses, 19 ; Fresnel's Invention, 19, 20 ; Construction of Polyzonal Lens, 20 ; Adaptation to Revolving Lights, 21 ; Fixed Lens Lights, 22 ; Totally reflecting Glass Zones, 23 ; Fixed and Flashing Lights described, 23 ; Example, 24. 4. The Holophotal System, 25 ; Mr. T. Stevenson's Arrangements, 25, 26 ; Dimen- sions and Cost of Lenticular Apparatus, 26, 27. CHAPTER IV. Ileneral Remarks 27 Difierence in appearance of Lens and Reflector Lights, 27 ; Harbour and Tide Lights, 28 ; Distance to which Lights are visible, 28 ; Colour of Lights, 28 ; Dipping Lights, 29 ; Masking of Lights, 29 ; Control, 29 ; The Trinity House, &c., 29, 30 ; Foreign management, 30, 31. VI CONTENTS. LIST OF LIOHTHOUSES. Description of Tables 32 England, Thames Mouth, 33 ; South Coast, 34—36 ; West Const, 37 — 40 ; East Coast, 41—43. Scotland, East Coast, 44, 4ff ; Orkney and Shetland Isles, 40, 47 ; West Coast, 47—49. Ireland, South Coast, 60 ; East Coast, 01 ; North Coast, 62, 63. Norway, 64 ; West Coast, 64—66 ; White Sea, 64. Norway, South Coast, 66, 67 ; Cattegat, 68 ; Denmark, the Belts, 60. £a/