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 #:
000467
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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452 POSITION OF PROJECTION APPARATUS [Cn. XII screen, but as the distance is usually considerable, the screen image will be good on a vertical screen. The position of the lantern should never be so high that the screen image will be distorted. § 617. Apparatus in the middle of the auditorium with raised seats. — If the apparatus cannot be at the back of the room in an amphitheater then a space or alcove must be made somewhere in the middle by omitting a certain number of seats. The machine is liable to be more or less distracting if in the middle of the room, but sometimes this cannot be avoided on account of distance or the form of the amphitheater (fig. 241). FIG. 244. PART OF A LECTURE ROOM WITH THE MAGIC LANTERN ON THE LECTURE TABLE DIRECTED TOWARD THE AUDIENCE AND A MIRROR TO REFLECT THE IMAGE ON THE SCREEN IN FRONT OF THE AUDIENCE. B Black-board with hidden light behind the curved metal shield (H L). Ml M Magic lantern pointing toward the audience. The mirror reflects the image back to the screen in front of the audience. The mirror also serves as a shield. Sc The image screen. By means of the pulley and cord it is inclined on its hinges at the lower edge toward the mirror of the magic lantern. In this case it is not inclined sufficiently to meet the axial ray at right angles, hence there will be some distortion of the image and the upper edge will not be in sharp focus when the lower edge is. T Lecturer's table. With such an arrangement the lecturer can demonstrate with the lantern conveniently, and still have the screen in front of the audience. If he uses lantern slides they must be put in the holder facing the objective, not the light or there would be a mirror image on the screen (fig. 213).