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MANAGERS AND PROJECTIONISTS
545
If it is desired to install the machine within the projection room, then the panel board carrying the switches, etc., is mounted, at suitable angle, on the top of the machine itself. If it is desired to install the machine outside the projection room, then a suitable panel board is supplied, for installation a*t a convenient point on the projection room wall. This panel is illustrated in Figure 166.
The transformer is mounted within the machine itself, in a compartment immediately beneath the motor and commutator. It is supplied for any commercial voltage.
Figure 166 Wall Panel
The panel of the type 25 Syncroverter carries a double-scale O-center voltmeter; also a double-pole double-throw inclosed switch, the purpose of which is to insure correct polarity at the arc. Upon starting the machine the projectionist closes this switch, either to the right or left, according to the indication of the voltmeter needle. The main switch, also mounted on the panel, is of the snap-switch type ; also a starting button is supplied. This latter is pressed down and held for about five seconds to start the motor. It then is released. An ammeter and amperage control also are mounted on the panel.
When it is desired to locate the Syncroverter outside the projection room, panel Fig. 166 is supplied, which carries the ammeter, switches and a separate amperage control for each arc. This panel is 13 by 18 inches in size and 6^2 inches thick.
Since the line voltage is reduced to arc voltage by the