Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine (1914)

Record Details:

Title:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine
Date:
1914
Author:
Gage, Simon Henry, 1851-1944
Publisher:
Ithaca, N.Y. : Comstock Publishing Company
Volume:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine
Leaf #:
000361
Language:
English
Subjects:
Lantern projection, Motion picture projection
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Bibliography: p. 693-703
Date Added:
July 19, 2022
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346 DRAWING WITH HOUSE CURRENT [CH. X With the horizontal microscope, unless one uses a table with a drawing shelf (fig. 187), the microscope must be raised on a block or support of some kind and clamped to the block so that it will be rigid (fig. 193-194). A convenient height is 250 mm. (10 inches). To vary the magnification slightly, the distance can be made greater by using an additional block, or it may be made less by raising the drawing surface. For a very convenient arrangement for changing the elevation of the microscope see fig. 198, 20 iC. For obtaining the scale or magnification of the drawing see § 508-510. § 497. Getting the light through the horizontal microscope with the plane mirror. — The simplest method is to place the lamp FIG. 193. DRAWING WITH THE MICROSCOPE IN A DARK ROOM. In the arrangement here shown the light is from a small arc lamp drawing current from the house lighting system. The supply cable and the lamp socket are shown, then the separable attachment plug and the supply wires with the rheostat inserted along one wire (fig. 188). The arc lamp is at the level of the microscope mirror and at right angles with the microscope axis. The light from the arc lamp is reflected up to the substage condenser by the mirror and passes on through the specimen and microscope as shown in fig. 192. The shield between the lamp and drawing surface is to keep stray light from reaching the drawing surface. The shield is represented as transparent. It was left in place during only a part of the time of the exposure in making the photographic negative.