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 #:
000440
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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346 THE ADVANCE OF PHOTOGRAPHY upon several conditions ; thus, it alters with an alteration of the pressure of the residual gas. with the current passing through the tube, and likewise with the nature of the gas contained in the tube. The Rontgen-rays . — The fact that the colour of the light emitted during the discharge can be varied by altering the nature of the contained gas is made use of in the well-known Geissler tubes, which are so much used for exhibition purposes. It was not until November 1895 that Rontgen, at the Institute of Phvsics in the University of Wurzburg, Fis. 153. Bavaria, when working with vacuum tubes in which the pressure was so low that a bright green phosphorescence could be seen on their glass Avails, noticed some very peculiar phenomena taking place in the neighbourhood of these tubes. A screen covered with a barium-platino-cyanide preparation became luminous when held near such a tube. Such screens made of chemically prepared vellum and having one side covered with barium-platino-cyanide are mounted in wooden frames and can be bought ready for use. When using such a screen, the prepared side should be turned away^from the object. The tube could be covered with a sheath of thin,