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 #:
00074
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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52 THE ADVANCE OF PHOTOGRAPHY setting sun the reddish rays predominate, while the blue and violet are in part wanting. For this reason the chemical action of sunlight is very feeble in the morning and the evening ; it increases as the sun rises above the horizon, and it attains its greatest intensity about noon. The cause of the red hue of the morning and evening sun is found in the fact that as the rays of light pass through the air a large amount of scattering of light takes place ; this is especially so in the case of the blue rays — for which reason the air (that is, the sky) appears blue — whereas the yellow and red rays are more easily transmitted. If E (fig. 17) is the earth surrounded by the atmosphere A, $the sun at the moment of sunrise, S" the sun at the moment of sunset for the place 0, and S' the sun at noon, it is apparent that the sun's rays at sunrise and sunset have to travel much further through the atmosphere — namely, the distance between a and 0 — than when the sun is in the zenith S'. But in proportion as the stratum of atmosphere through which the sun's rays must pass to arrive at the spectator is thicker, the weaker becomes the light. The greater the amount of dispersion which takes place, the more difficult it is for the easily scattered ra}^s to reach the earth. It follows from this that on high mountains the