The advance of photography : its history and modern applications (1911)

Record Details:

Title:
The advance of photography : its history and modern applications
Date:
1911
Publisher:
London : K. Paul, Trench, Trübner & Co., Ltd.
Volume:
The advance of photography : its history and modern applications
Leaf #:
000427
Language:
English
Subjects:
Motion Pictures, Motion pictures--Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
November 02, 2023
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MICRO-PHOTOGRAPHY AND PROJECTION APPARATUS 333 the eye-piece which should be used in focussing the object, before trying to do so by means of the camera screen. The eye-piece tube can be moved up and down, and is fitted with a prism, which deflects the rays transmitted by the objective into the eye-piece when the tube is pushed in. When it is wished to allow the rays to pass direct into the camera attachment, all that is necessary Fig. 145. is to withdraw the tube of the eye-piece so as to move the prism out of the path of the rays. Perhaps it is a bit difficult to understand the directions in which the small beam of light travels in its course through the apparatus, but a reference to fig. 146 may help to remove some of the difficulties. Let us imagine that the source of light is extremely small and is situated at B. Then the thick black lines J would represent the position of the iris diaphragm.