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 #:
000248
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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CH. IX] PROJECTION WITH SUBSTAGE CONDENSER 233 •to be different from what it would be with the main condenser only ; or (2) to make the aperture of the illuminating cone correspond with that of the objective. The positional reason (i) can only have weight when combined apparatus is used, that is, when a magic lantern objective as well as microscopic objectives are used without changing the distance between the main condenser of the microscope or the magic lantern objective. FIG. 130. OCULAR MICROMETER WITH MOVABLE SCALE. (Cut loaned by the Spencer Lens Co.). This is a Huygcnian ocular with a 5 mm. scale divided into twenty K" mm. intervals. The pitch of the screw moving the scale is Y\ mm., therefore one complete revolution of the drum moves the scale one interval or '--4 mm. The drum is divided into 100 graduations thus enabling one to measure looth of an interval on the micrometer scale. This ocular micrometer combines the advantages of the ocular micrometer with fixed scale and the filar micrometer. To complete the measurement of an object not exactly between any two micrometer lines the drum need be revolved only partly around. With reference to the aperture (2) it is one of the fundamental laws of microscopic vision that the brilliancy and clearness of details depend largely upon the aperture of the light which illuminates the object, and which passes through the objective to form the retinal or the screen image. As the numerical aperture of objectives varies greatly it is necessary, if the clearest and most brilliant images are to be produced, to light the object with a numerical aperture equal to that of the objective. Where substage condensers are used arrangements must be made for this.