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 #:
000488
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] DO AND DO NOT WITH ROOMS AND SCREENS 473 9. If possible place the projection apparatus at the back of the room (§612). 10. The axial ray of the image beam should strike the screen at right angles (§614). 1 1 . Incline the screen if necessary (§614). 12. Light the black-board by lights behind a curved, metal shield (fig. 240). 13. If a translucent screen is used the objects must be put into the apparatus with the picture facing the objective (§516). 14. Use a good screen (§ 621). 15. If you use a mirror or metalliic screen remember that it does not reflect equally throughout the 180 degrees (§ 629). 1 6. Make the screen image large enough so that the most distant spectator can see the details (§633, 639). 9. Do not place the projection apparatus in the middle of the room if it can be avoided. 10. Do not let the axial ray strike the screen obliquely. 1 1 . Do not incline the screen unless necessary. 12. Do not try to use the blackboard without lighting it by hidden lights. 13. Do not forget the rules for erect images when using a translucent screen. 14. Do not use a dirty screen. Wash it or give it a fresh coat of white paint. 15. Do not use a mirror or metal faced screen in a square room ; such screens are not good for the fine details necessary in micro-projection (§ 360). 1 6. Do not have the screen image too small nor too large.