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 #:
000464
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. XII] POSITION OF PROJECTION APPARATUS 449 § 614. Level room with the apparatus near the screen. — It is sometimes desirable to put the apparatus near the screen. Then provision must be made by removing some of the seats if the center aisle is not wide enough. The apparatus must usually be raised somewhat also, and sometimes the objective inclined more or less upward. In case it is desired to have the apparatus very near the screen it must be pointed upward considerably and then the screen should be hinged at the bottom so that it can be inclined toward the lantern till it is perpendicular to the optic axis. The simplest way to fix the screen in any position, and to change the position is by means of ropes and pulleys at the top. FIG. 241. LECTURE ROOM WITH RISING SEATS, AND THE LANTERN IN THE MIDDLE OF THE ROOM, NOT AT THE BACK. B Black-board lighted by the hidden lights (H L) behind a curved metal shield. L T Lecturer's table in front of the audience. Ml E The magic lantern (Ml) ; its rays shown in full lines, and the episcope or opaque lantern (E) with its rays shown extending from the mirror (M) in dotted lines. Sc The screen for receiving the image. As the magic lantern must be elevated the screen is tipped toward it to meet the axial ray at right angles. For such a position of the magic lantern the projection objective must be of shorter focus to give the desired size of image than when the lantern is at the back of the room (§ 636).