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 #:
000388
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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308 THE ADVANCE OF PHOTOGRAPHY This has always been of peculiar interest, since by comparison of this spectrum with those obtained of the light received from the planets Jupiter, Saturn, etc.^ it becomes possible to ascertain whether there is water vapour in their atmospheres. Before the introduction of photography this method of comparison was at its best a very doubtful procedure, for the observer had to carry in his memory a picture Fig. 129. of the spectrum of the moon, and in this way compare it with that of the planets, and since the absorption would be only one of degree, no definite conclusions could be arrived at. Now, Slipher, at Lowell Observatory, has taken striking comparison spectra of Jupiter, Saturn, Uranus, and Neptune, with the moon, and these can, of course, be examined with ease, and accurate determinations of the relative values of the absorption bands can be made.