1871-1900 Yaquina Head Lighthouse Letter books

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Pages That Mention Fresnal

Vol 601Topographical survey and lens description 1883

7
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7

Cape Disappointment Light Station, W.T. 1. Lens made Louis Soulter & Co. Paris, 1854. “by order of Secretary of Treasury and the Light-House Board, W.A. Bartlett, Lieut, U.S.N., Special ??? .” First order catadioptric Fresnal lens. Fixed white. Range, E.N.E. by E’d. S’d & W’d to N.W. by W. ½ W. 8 panels in lens apparatus. 12 prisms above dioptric drum. 6 “ below “ “

2. Funk’s hydraulic float lamp, 4 wick. Height from base to top of burner 35.11 inches. 3. Distance between centers of the three pillars on which the lamp rests, 15.56 inches. 4. Height from focal plane of lens to top of ring at upper part of lens, 62.46 inches. 5. Diameter of this ring; inside, 23.5 inches, outside, 26.58 inches.

Last edit about 7 years ago by yaquinalights
8
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8

Tillamook Rock Light Station, Oreg. 1. Lens made by Henry Lefrante, Paris. First order, catadioptric Fresnal lens. Revolving, once in two minutes, with white flash every five seconds. 24 panels in lens apparatus. 18 prisms above dioptric drums. 8 “ below “ “ .

2. Funk’s 1st order hydraulic float lamps. Height from base to top of burner, 34.31 inches. 3. Distance “between centers of bolts on which the lamp directly rests”, 15.82 inches. 6. Height from focal plane of lens to lower edge of cylinder at top, 62.52 inches. Inside diameter of this cylinder 6.29 inches.

Last edit about 7 years ago by yaquinalights
9
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9

Cape Flattery Light Station, W.J. 1. Lens made by Louis Soulter & Co. Paris, 1854. First order catadioptric Fresnal lens. Fixed white. Range, S.E. by S ¾ S. by S’d, Wd. & N’d to E.N.E. 8 panels in lens apparatus. 12 prisms above dioptric drum 6 “ below “ “ 2. Funk’s hydraulic float lamp, 4 wick. Height from base to top of burner, 34.80 inches. 3. Distance between centers of the three pillars on which lamp rests (15.54, 15.54, 15.24) inches. 4. Height from focal plane of lens to top of ring at upper part of lens, 62.90 inches. 5. Diameter of this ring; inside, 23.51 inches, outside, 27.64 inches.

Last edit about 7 years ago by yaquinalights
10
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10

Cape Foulweather Light Station, Oreg. 1. Lens made by Barbier & Fenestre. First order catadioptric Fresnal lens. Fixed white. Range, S.E. by E. by S’d & W’d to N.W. ½ W. 8 panels in lens apparatus. 18 prisms above diaptric drum. 8 “ below “ “ . 2. Funk’s hydraulic float lamp, 4 wick. Height from base to top of burner 33.46 inches. 3. Distance between centers of the three pillars on which the lamp rests, 16.00 inches. 4. Height from focal plane of lens ot top of ring at upper part of lens 63.18 inches. 5. Diameter of this ring, inside, 22.10 inches- outside, 26.79 inches. “The ring at upper part of lens is quite large and inside is a smaller ring on crown-piece to which the supply reservoir is secured.”

Last edit about 7 years ago by yaquinalights
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