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 #:
00065
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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THE CHEMICAL ACTION OF LIGHT 43 The situation of these lines agrees exactly with that of certain dark lines in the solar spectrum. For example, the yellow lines in a flame coloured with common salt exactly coincides with the D lines in that spectrum. The green lines in a flame of magnesium coincide exactly with lines E and b. This remarkable coincidence led to the surmise that the lines in the sun's solar spectrum might owe their existence to the same substances that produced the coinciding bright lines in flames. KirchofT converted this surmise into a certainty, and was thus able to determine from the lines in the solar spectrum the substances present Fig. 14. in the sun, and thus to demonstrate by spectrum analysis the chemical composition of a star distant many millions of miles. Action of Coloured Light upon Photographic Plate. — But the spectrum contains still other wonders, which cannot be discerned by the human eye, although it is possible for this to be done by aid of the photographic plate. If a sensitive plate be exposed to the action of the continuous spectrum, it is observed that the red and yellow rays have scarcely any action, whilst those of the green have but a very weak effect. Light blue produces more effect, dark indigo and violet the most ; and in the space where no rays can be perceived by our eyes, a distinct action is produced, and this action extends beyond the