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 #:
000425
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 331 by means of a rack and pinion, and for slow motion a micrometer is provided. The lamp in this case is an electric arc, the carbons of which can be adjusted by means of screws. The carrier marked 82 (fig. 145), which can be moved along the slide, is fitted with an iris diaphragm and lenses, for illuminating the object. The lamp employed here is of a special make, and has been found to work excellently Fig. 144. in this connection, and also in the optical projection lantern. It requires a continuous current of about 4 amperes, and so can easily be fed from the lighting circuit by placing it in series with a suitable resistance. The state of the carbons can be watched from time to time through a dark glass window. But the special feature is that the two carbons are placed in directions at right angles to one another, the positive being in a horizontal position along the line of projection, and the negative in a vertical position. By this means the uniformity in the amount of light is ensured, and this of course is extremely