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464 HANDBOOK OF PROJECTION FOR
are loose in their holder, draw sandpaper in direction of rotation only, since if you draw it both ways the brush will wiggle back and forth and will not fit the commutator.
Transverters are made for all commercial frequencies of current, for all commercial voltages, for single and two or three phase, and with an output capacity of from 35 to 125 amperes.
DOUBLE ARC INSTALLATION INSTRUCTIONS.— Transverters should be set on a floor which is entirely free from vibration. It is not necessary to bolt them down. Set the machine on the four cork pads which come with it. Its weight will hold it in place.
WIRING. — Make connection from the A. C. line service to the starting switch, and from the starting switch to the motor terminals, as shown in Fig. 152. Having done this, close starting switch and make sure the armature rotates in the direction indicated by arrow on top cap of machine. If, in the case of two or three-phase supply, the armature rotates in the wrong direction, it must be reversed by reversing one of the phases of the motor.
CAUTION. — Do not attempt to change direction of rotation or polarity by changing connections inside the machine. The machines are all checked up complete, together with their equipment, when tested. The motor must be connected to proper side of the line, and connections to panels must be made correctly in order to bring polarity of instruments and lamp right.
FUSES. — Fuse the A. C, or motor side of these machines only. The D. C. side does not require fuses or switches, other than those shown in wiring diagram. The fuses at motor starting switch must be large enough to carry the maximum load of the machine. Manufacturer's instructions, which accompany each transverter, will give the proper size of fuses for each machine.
WIRING TO LAMPS.— Use wire of sufficient size to carry the rated D. C. amperage from point L on Transverter to point A on panel board, Fig. 152. No. 12 or No. 14 wire may be used to connect point F on Transverter to point F on panel board, Fig. 152.
OPERATING INSTRUCTIONS.— Before starting motor, have lamp carbons separated and projector table switches open Close motor starting switch. Close short circuiting switch which controls lamp you do NOT wish to use. Allow suffi