1871-1900 Yaquina Head Lighthouse Letter books

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Pages That Mention focal plane

Vol 601Topographical survey and lens description 1883

7
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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
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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
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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
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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

1871-1872 keeper selection and LH building Vol. 336

22
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22

173 1/2

Notice to Mariners (no. )

United States of America {carat: "Northwest Coast. "} Oregon. Light-House at Cape Foulweather (Yaquina Point Head).

Notice is hereby given that a Light-House has been erected Cape Foulweather. (Yaquina Point Head) Oregon, and the lights will be erected on or about the night of the 1st of March 1st of February 1873, and every night after from sunset to sunrise.

The focal plane is 81 feet above the ground, and 150 feet above sea level. The lights can be seen in clear weather from the deck of a vessel, 15 feet above the sea, at a distance of eighteen {carat: "and a half"} nautical miles. The lens {carat: "is dioptic, of the"} a 1st order Fresnel, illuminating of the horizon 240 degrees {carat: "and"} will show a fixed white light.

The tower {carat: "is"} of brick, is painted white, and the lantern {carat: "is painted"} black.

The Keepers' Dwelling, a two-story frame building, east of the tower is painted white.

{circled:A} Latitude 44 {degree symbol} 40' North. Longitude 124 {degree symbol} 04' West.

Last edit over 6 years ago by SiobhanLeachman
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