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 #:
000200
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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162 THE ADVANCE OF PHOTOGRAPHY This halation circle is often evident in the photographic negatives of stars when made on unbacked plates. j Orthochromatic Plates. — The silver salts contained in the film of the sensitive plate are much more strongly affected by light of some colours than that of others, and the light which has the greatest effect upon the human eye has not the greatest effect upon the film of the ordinary photographic dry plate. N M L >" f. D C B A Fig. 7; Suppose that in fig. (77) the base line in each case represents the spectrum. The vertical lines N to A will then represent certain fixed dark lines (Fraunhofer lines, see p. 42) which are visible in the solar spectrum. A being at the extreme end of the red and H at the extreme end of the violet, thus L M N are in the ultra-violet region. The other lines lie as follows : B in the red, C in the orange, D in the yellow, E in the bluish green, F at the beginning of the blue, and G between the blue and the violet.