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 #:
000434
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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340 THE ADVANCE OF PHOTOGRAPHY the lantern objective which is used for projecting the images upon the screen. The lamp with the attached condensers can be moved down between the vertical supports (see fig. 148), so that by means of a mirror the light may be sent up through a condenser lens situated on the stage, but kept covered when not in use. Slides and sections up to 21 cm. diameter can be placed on this lens, and images of them projected upon the screen. Then again, the lamp and attachments may be tilted Fig. 150. downwards 45° from the horizontal by means of the handle attached to it. There is no fear that the lamp may be given a wrong tilt, since it can only rest in the proper position. This is extremely useful for projecting the images of opaque objects. The method by which this is accomplished is made clear by fig. 151. Images of objects placed on X in the illuminated area are reflected by the mirror G through the attached projection apparatus. It is also possible by another adjustment of the lamp to project images of objects which must be kept in a vertical position. For this purpose, the specimen is so placed at the side that it ma}' be illuminated by the lamp and reflected in the mirror. Such a piece of apparatus as the one just described is of the greatest importance for demonstrations, which