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 #:
00072
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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50 THE ADVANCE OF PHOTOGRAPHY O friction after the ingredients are mixed. If the chlorate is not in a sufficiently fine state it should be ground to the necessary degree of fineness before mixing with the magnesium powder. When it is desired to fire any of this powder it should be placed in a shallow ThrGEtd ^a^ ^ray made °f iron or lead, not in a heap but in a narrow strip. To ignite it, a very good plan is to use a piece of paper which has been steeped in a strong solution of potassium nitrate and then dried. This touch-paper should be arranged so that one end of it is in contact with the powder and the other projects over the edge of the tray. The far end from the powder being ignited, the operator has a chance to move to a safe distance before the powder is fired. Of course, in cases where such an arrangement is used, the necessary focussing should be done previously by means of the ordinary lighting arrangements. When all is ready the shutter of the dark slide can be drawn, the cap of the camera can be removed, and the exposure made. Only those lights which shine directly into the lens need be actually put out. It would be quite possible for the operator to seat himself with the group if desired, if the length of fuse was made sufficiently great. Simple devices such as the Geka and Vesta flash bags are now obtainable, by means of which it is possible to dispense Fuse Fig. 16