Handbook of projection for theatre managers and motion picture projectionists ([1922])

Page scan 000900 from Handbook of projection for theatre managers and motion picture projectionists

Record Details:

Title:
Handbook of projection for theatre managers and motion picture projectionists
Date:
[1922]
Publisher:
New York, Chalmers
Volume:
Handbook of projection for theatre managers and motion picture projectionists
Leaf #:
000900
Language:
English
Collection:
Books
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
14
Date Added:
July 19, 2022
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MANAGERS AND PROJECTIONISTS 865 thumb screws down tight, unless you want a broken mirror. DISTANCE.— FILAMENT TO MIRROR.— Distance center of back of mirror from lamp filament must be as shown in optical diagram, Fig. 362. This is important to good results The correct distance may be obtained by turning knob A, Fig. 361 in the required direction. Having placed the mirror in position and secured the correct distance back of mirror to lamp filament, unlock the mirror by turning knob D, Fig. 361, to the left, and swing the mirror to one side as far as it will go by means of knob G, Fig. 361, locking it there by means of knob D. This is to prevent focusing the filament image, which is not desired at this stage of the proceedings. „ SIZE LENs(a| DIA)II FOR i. SIZE LENS( l|'bu) 9 /^'CONDENSER ^CONDENSER APERTURE PLATE OPTICAL SYSTEM THE PRECISION MACHINE CO. INC. I Figure 362. LOCATING THE LAMP FILAMENT IMAGE.— In the center of the douser is a pin hole. Light your lamp and you will find an image of the lamp filament projected through the pinhole to the automatic fire shutter, upon which it must be centered. Should the image be either too high or too low, it may be raised or lowered by means of knob E, Figs. 352 and 361, which raises or lowers the lamp as a whole. The image may then be centered sidewise by first loosening thumbscrew G. Fig. 360, and turning knob F, which moves the lamp sidewise.