File:The American annual of photography (1912) (14579520307).jpg

Identifier: americanannualof1912newy (find matches)
Title: The American annual of photography
Year: 1912 (1910s)
Authors:
Subjects: Photography
Publisher: New York : Tennant and Ward
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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Text Appearing Before Image:
i inch deep, is now made around the opening, just largeenough for the shoulder (A, Fig. i) to rest in.
Text Appearing After Image:
Fig. 2. The lens is held in position by a small brass plate at thetop (C, Fig. i) and a sliding catch at the bottom (D, Fig. i).For the smaller lens, a plate of aluminum (A, Fig. 2) Ysinch thick, is cut to fit the circular rabbet in the lens-board.In the center of this aluminum disc, an opening is cut toreceive the smaller lens. This opening may either be threadedto screw onto the lens-mount like the regular flange, or thehole may be made just large enough to let the threads on thelens pass through freely and the shoulder (B Fig. 2) rest 301 oti the disc, the regular flange being screwed on at the back,to clamp the lens on tightly. The disc and lens are now fitted on camera, as described forlarge lens and Fig. 2 shows the appearance. Any number ofthese aluminum discs may be provided to fit different lenses,all fitting the large rabbet on camera lens-board. The discs being thin and light are much easier to carrythan as many boards, as they may be readily slipped intoa pocket without in

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