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 #:
000398
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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318 THE ADVANCE OF PHOTOGRAPHY found that the exposure of the sensitive plate to a very faint light tends to shorten the time of exposure required for the reproduction of very faint spectra of stars.1 He explains this action on the part of light as follows : Let the abscissae in the diagram (132) be units of time during Avhich the plate is exposed, and the ordinates represent the image density which results from this exposure. At first it will be seen that the increase in density takes place very slowly as time proceeds. This continues until the point A is reached, after which the density increases very rapidly with further exposure. Now the preliminary short exposure to a very weak source of light is most effective if the density is carried 1 Astro physical Journal, xxvii. 5, 1908.