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MANAGERS AND PROJECTIONISTS 515
ting grease into the bearings as required, and renewing the brushes when necessary. This may be quite true, in a general way, but we would nevertheless advise the projectionist to examine the machine carefully, at set intervals, because that machine never was and probably never will be made which will not require more or less expert attention.
DON'T ROCK BRUSHES.— The rocker arm should never be moved, because the performance of the Transverter depends very greatly upon the correct setting of its brushes. This adjustment is very carefully and accurately made at the factory, and the correct position of the rocker arm is marked. If after putting in new brushes the characteristics of the machine seem to be altered, it indicates merely that the brushes are not making proper contact with the commutator. The fault will correct itself in time, or it may be immediately corrected by inserting a piece of No. 1 sandpaper between the brushes and commutator, one brush at a time, sand side next the brush, and with the full tension on the brush, drawing the sandpaper back and forth around the commutator until the brush face is ground to fit the curve of the commutator surface. See Fig. 150, page 505. If brushes 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.
Series transverters are made for all commercial frequencies of current, for all commercial voltages, for single and two or three phase, and with a capacity of from 20 to 150 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 wrrong direction, it must be reversed by reversing one of the phases of the motor.
The variations in wiring a motor generator set to fit the conditions met in the various theatres are such that we cannot hope to cover them within the limits of this book and we