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 #:
00041
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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HISTORICAL SURVEY 19 thus the underlying paper remains white in these places. Therefore, if sufficient time is given for the operation of the light, a white copy on a dark brown ground is obtained in this manner, which is fixed and washed exactly like the leaf -prints described above. This copy is reversed with reference to the original, like an object and its reflection in a mirror ; in other respects it is a faithful representation, stroke for stroke. The largest as well as the smallest drawing could be copied equally well, copies several feet square often being made. Large printing frames were used for this purpose, and large wooden dishes covered with a coating of asphalt were employed for fixing and washing the prints. This operation was known by the name of the lichtpaus process. The black copy is, of course, a negative picture, but a white copy could be prepared from this by Fig. 6. the sensitized all the white placing it upon paper ; then the light shines through lines, and colours the paper lying under them of a dark hue, whilst it remains white under the dark places of the negative. In this manner a picture called a positive was produced, which perfectly resembled the original. The washing and fixing were carried out just as with the negative. Fig. 6 represents a positive of this kind taken from the negative (fig. 5).