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514 HANDBOOK OF PROJECTION FOR
can be lifted off the motor shaft without any removing of bolts or unfastening of any other parts.
In the 20 and 30 ampere sizes the armature and rotor are both mounted on the same shaft and are removed from the machine as a unit.
BEARINGS. — In the base of the machine is both a radial and a thrust ball bearing, Fig. 151, the latter carrying the weight of the combined armatures and fan. The center frame section carries a radial bearing* Fig. 151, and there is a radial bearing at the upper end of the generator armature shaft, Fig. 151, so that the armature is very well supported. The bearings are all ball bearings, and they are all arranged for grease lubrication.
CAUTION. — Grease for lubrication should be very carefully selected. It must be not only entirely free from graphite and acid, but also free from any elements which would in time form acid, because acid destroys the surface of the steel balls and the runways, causes pitting and works havoc. For these reasons we emphatically recommend that grease for use with the Transverter bei purchased from its manufacturer, the Hertner Electric Company, Cleveland, Ohio.
The tendency is always to use too much grease on ball bearings rather than too little. Too much grease is not only a waste of good material but the excess is forced out of the bearing housings in such quantities that it is spread over the windings and other parts of the machine where it gathers dust and grit and may lead to serious damage.
The parts are shown in the phantom view, Fig. 151, which also gives the over-all dimensions. It will be observed that over the range of sizes covered by the three bearing vertical machine the changes come in the height rather than in the diameter.
The Transverter is supplied with either one of two types of panel, termed "Panel A" and "Panel B." These consist of an inclosed steel cabinet on which is mounted a field rheostat for the generator, by means of which the projectionist may vary the current from somewhat above to somewhat below normal. The panel also carries a voltmeter and ammeter for the arc circuit. The only difference in the two panels is that panel B carries two quick-break switches to be used in making change-over. It is for the two-arc machine.
The manufacturer's claim is that the Transverter should require no attention beyond keeping it reasonably clean, put