Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures (1914)

Record Details:

Title:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures
Date:
1914
Author:
Gage, Simon Henry, 1851-1946
Publisher:
Ithaca, N.Y. : Comstock Publishing Co.
Volume:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures
Leaf #:
000297
Language:
English
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Bibliography: p. 693-703
Date Added:
July 19, 2022
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282 HIGH POWER MICRO-PROJECTION [Cn. IX (2-3 mm. oil or water immersion) and for the 3 and 4 mm. dry objectives the condenser is usually very close up to the slide, so that the object is practically in the focus of the beam of light. For the 8, 10, 12, and 16 mm. objectives the substage condenser must be separated sufficiently from the specimen to light the whole field. It will be found in practice that one must be more precise in keeping the substage condenser at just the right level for projection than for ordinary direct microscopic observation. Hence, it will be found that for a thin slide the condenser, even for high powers, may need to be separated slightly from the object, while if the slide on which the specimen is mounted is thick, the condenser may need to be as close to it as possible. § 408. Screen distance for high power projection. — This should not be excessive, for even in the darkest room the image will FIG. 157. LEWIS WRIGHT'S PROJECTION MICROSCOPE. (From Wright's Optical Projection). C Condenser of three plano-convex lenses. -•1 Alum eell for absorbing radiant heat. P Plano-concave lens of highly dispersive glass to aid in correcting the aberrations of the condenser and to render the light parallel. S C Substage condenser. For low powers but one lens is used. .V Stage. () Object and objective. A M Amplifier. F Fine focusing adjustment. R2 Rack and pinion, coarse focusing adjustment. .ft, Coarse adjustment for the substage condenser.