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

Page scan 000592 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 #:
000592
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 557 and leads 2 and 3 are taps connecting to the primary coil as per Fig. 200, page 546. If a fuse plug of sufficient capacity to carry the primary current be placed in receptacle C, with receptacles A and B empty, then as you will readily see, the whole of the primary coil will be in use. This connection is designed for use where the primary voltage is a little above normal, or when you require the lowest amperage the economizer will deliver. If the fuses be removed from C and placed in A, then a proportion of the primary coil will be cut out, which will have the effect of raising E. M. F. of the Figure 208. Figure 209. secondary voltage, hence the amperage at the arc. The fuse plug should be in receptacle A when the voltage is a little below normal, or when the highest available amperage is wanted at the arc. CAUTION. — Do not unscrew fuse plug while the arc is burning. If you do an arc will be formed when the fuse disconnects from its contact, which will probably result in a ruined fuse receptacle. Aside from this the arrangement is cheap, practical, and one which should never give trouble. Fig. 209 shows the appearance of the latest Hallberg economizer. The projector table switch should always be on the line or primary side of the economizer. POWER'S INDUCTOR.— Power's Inductor, Fig. 210, consists of a well insulated, strongly clamped laminated core