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 #:
000365
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 295 plane mirror C so arranged in the path of the parallel beam of light that the telescope can be used in a position parallel to the collimator. In the place of the eye-piece of the telescope the slit F is substituted. B is the ordinary lens used in the collimator ; D is a prism or prisms for obtaining the spectrum of the light which passes through the slit A ; E is a simple lens or a camera lens by means of which an image of the spectrum is formed in the plane of the secondary slit, F ; G represents the photographic plate, which remains in a fixed position. The primary slit moves across the image of the sun, 3 I ^ 3 Fig. 122. and the ordinary sunlight which passes through that slit is made parallel by the lens B. It is then reflected by the plane mirror, C, through the prisms, D, by which its spectrum is obtained. The second slit, F, can be so arranged that only light of one distinct colour, corresponding to some particular line on the spectrum, passes through. Then, since all the parts from A to F are fixed with respect to one another, whatever spectral line is arranged to fall on F at the beginning of the exposure will continue to do so until the end. The photographic plate, G, must be placed as nearly in contact with the slit F as is convenient, and of course be carefully shielded from all other sources of light.