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

Page scan 000258 from Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine

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 #:
000258
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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CH. IX] BLACK APPARATUS FOR MICRO-PROJECTION 243 properly and has ill success in general, there is no wonder, as he has blinding reflections constantly in his eyes. With a dull black finish for all outside surfaces, if the apparatus is properly built, this defect will be abolished. Polished black finish will not answer, for it reflects almost perfectly. The finish must be dull, dead, or lusterless, then the light will be mostly absorbed, and so small a part reflected that no inconvenience is produced. § 371. Blackening the interior of projection apparatus. — As with the exterior of projection apparatus, so the interior of all the parts should be dull black to avoid internal reflections and consequent confusion. This is especially true of the objective mountings, the tube of the microscope and the amplifier tube. Lewis FIG. 137. DIAGRAM TO SHOW THE SIZE OF IMAGE WITH THE SAME OBJECTIVE AND DIFFERENT LENGTH AND DIAMETER OF MICROSCOPE TUBE. Objects The different lengths of object shown. Objective The projection objective. Microscope Tube Microscope tubes with diameters of 48, 30 and 23 millimeters. /, 2 Rays which are stopped by the largest tube. Ray 3 The marginal ray allowed to pass by the largest (48 mm.) tube. Ray 4 The extreme marginal ray allowed to pass by the 30 mm. tube. Ray 5 The marginal ray allowed to pass the 23 mm. tube. Axis The optic axis. Images The one in full lines is for the smallest tube. The others in broken lines for the tubes of larger size. By tracing back to the specimen it is seen that the larger tubes show correspondingly more of the object, the projection objective remaining the same.