Richardson's handbook of projection (1927)

Page scan 000155 from Richardson's handbook of projection

Record Details:

Title:
Richardson's handbook of projection
Date:
1927
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000155
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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MANAGERS AND PROJECTIONISTS 005 The connections are shown in Fig. 205. The "line" and "lamp" terminals are plainly marked on the top of the device, so that no mistake is possible in connecting. Connect the taps marked "line" to the supply line, through fuses and switch, and the taps marked "lamp" to the projector table switch. It makes no difference which wire leads to upper or lower carbon. The compensarc employs the means of changing secondary amperage illustrated in Fig. 206, in which A-B are small reactance coils which are cut in or out of series with the primary coil by means of switch lever, which swings to the left, its outer end carrying the handle seen on the top Fig. 206. Tracing the current, Fig. 206, you will see it must pass through both coils A and B, but with the switch making contact with E, coil B is eliminated, and with the switch in contact with F both coils A and B are cut out, The claim is that by this plan a constant current is secured at varying arc voltages. To determine whether or not all the switch contacts are in good condition, start the arc on low and then watch the effect on the screen illumination as you move the switch to intermediate and high. If the device is in good order on all steps the effect will be quite visible. Figure 204. POWERS INDUCTOR The Powers Inductor, Fig. 204a, consists of a well insulated, strongly clamped laminated core with the primary