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 #:
000430
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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336 THE ADVANCE OF PHOTOGRAPHY It is of course necessary to protect the film of the slides ; this is done by placing a plain glass slide on the film and fastening the two together by black binding, which is sold for the purpose. It is as well to place a small white circle of paper on one side of the slide r so that the operator ma}' know which face of the slide should be placed towards the light. Projection Apparatus. — It will give us a good idea of the development which this method of projecting images upon a screen has undergone, during the last thirty or fort}' years, by comparing the account and illustration of a lantern used for projection purposes, given in the edition of this book which appeared in 1874, with one of the best projection lanterns of the present day. Of course it is well known that there are still sold a great many lanterns fitted with oil lamps, similar in principle to the one here described, but when the following wras written such lamps were practically the only ones in general use. Early Form of " Magic Lantern." — " The magic lantern serves for the production of enlarged images by means of lenses. Instead of a simple lens, a system of lenses n n o o (fig. 147) is employed for enlarging, which gives more sharply defined images. The object is painted or photographed on glass plates, which are placed in the slide a b, and brightly illumined by the lamp L^ The concave mirror H and the lens m m are employed to concentrate the lamplight on the object that has to