Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

Page scan 000380 from Motion picture handbook; a guide for managers and operators of motion picture theatres

Record Details:

Title:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Date:
[c1916]
Publisher:
New York City, The Moving Picture World
Volume:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Leaf #:
000380
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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FOR MANAGERS AND OPERATORS 361 leg a secondary coil, the latter being of larger, heavier wire than the former, to which the arc lamp is connected. In Fig. 165 we have a view of the top of the Hallberg Economizer showing the various taps coming out. The two marked "to lamp" are the terminals of the secondary coil, which attach, through fuses, to the arc lamp, as per Fig. 163. The terminal Figure 172. marked "1," Fig. 172, is the constant, and must always be connected to one side of the source of supply. Either one of terminals "2" "3," or "4," Fig. 172, may be connected to the other side of the supply, according to the supply voltage and the amperage desired at the arc. Terminal "4" represents one end of the primary winding, of which terminal "1" is the other end. A, B, C are fuse receptacles, and leads "2" and "3" are taps connecting to the primary coil as per Fig. 154, Page 342. Now if a fuse plug of sufficient capacity to carry the primary current be placed in receptacle C, receptacles A and B being 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 fuse be removed from C and placed in A, then several turns of the primary coil will be cut out, which will have the effect of boosting the secondary voltage, and hence the amperage at the arc. The fuse plug should be in receptacle A when the line voltage is a little below normal, or when the highest available amperage is desired at the arc. CAUTION: Do not unscrew the fuse plug while the arc is burning. If you do the current will arc and burn out your fuse receptacle ; otherwise this arrangement is cheap, practical, and should never give trouble. Fig. 173 shows the appearance of the Hallberg economizer. The machine table switch should always be on the line side of the economizer. i*. Figure 173.