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 #:
000264
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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SOME EARLY APPLICATIONS OE PHOTOGRAPHY Meteorological Instruments. — Meteorological observations require a daily reading of the barometer and thermometer. To economize this reading, and yet to receive a perfectly safe register of the state of the thermometer and barometer at each minute, photography was soon turned to account. Let the reader imagine behind the tube of a thermometer R (fig. 97) or barometer, a drum, which revolves round its axis a by means of clockwork. Let sensitive paper be wrapped round this drum, and the whole be enclosed in a cylinder S, which has only a small slit behind the thermometer through which the light can penetrate. The upper part of the thermometer will let the light through, while the thread of quicksilver will stop the light. Therefore the strip of paper above the quick-silver will blacken, and the limit of the blackening on the paper will rise and fall with the mercury. Now the time can be marked beforehand on the paper. As the drum revolves once in twenty-four hours, the strip of paper need only be divided perpendicularly into twenty-four parts, and the first part be moved opposite the thermometer directly the clock strikes twelve, after which the whole may be allowed to revolve. Thus when suitable arrangements for lighting are made the blackened strip will show the height of the thermometer at all times of the day. In the same manner the height of the barometer can be registered by photography. Neumeyers Deep-sea Apparatus. — Professor Neumeyer Fig. 97.