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 #:
000387
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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ASTRONOMICAL PHOTOGRAPHY 307 ducts them to the prism P. The rays are then refracted and pass into the tube B, and can be observed through its narrower end. If the object is to photograph the spectrum thus seen, a photographic camera is placed lighttight on the tube B, its eye-piece is drawn a little out, and then the image of the spectrum appears upon the ground-glass screen. Fig. 129 shows a modern spectrograph which can be used either with prisms or with a grating. The prisms Fiit. 1-28. are automatically kept correctly set. In the case of the grating, means of rotation with rackwork and division are supplied. The camera takes a half -plate, and the spectrum runs the long way of the plate, and in this way six spectra can be taken, one above the other. The Presence of Water in Atmosphere of Mars. — Spectroscopic photographs of the light received from the moon show most distinctly the absorption lines due to the water vapour in the earth's atmosphere.