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HANDBOOK OF PROJECTION FOR
35 ampere machine is 3 inches less, and the 70 ampere is 3 inches greater in height, but the floor space required is practically the same for all the types.
In referring to ampere capacity the ratings are based on continuous operation. The 35 ampere machine will carry 5J amperes, the 50 ampere machine 70 amperes and the 70 ampere 90 amperes for short periods of time. This means that these machines will carry full load continuously, and stand the overload named for short periods, say not exceeding two or three minutes.
These machines are built for all standard voltages and frequencies, viz.: 110, 220, 440, and 550 volts; 25, 30, 40, 50 and 60 cycles, single, two and three phase.
CONSTRUCTION.— Referring to Plate 2, Fig. 178, it will be seen that the machine consists of four main castings, viz.: Base casting 20, which rests directly on the floor and
Plate 2, Figure 178.
contains in its center the cup or depression carrying ball race 6, which supports the entire armature ; casting 18, which rests on base 20 and forms a housing for the alternating current driving motor, the detailed construction of the windings of which are plainly seen at 19, Plate 2; main upper casting 7, which supports the pole pieces of the D. C. generator, and upper yoke casting 11, carrying grating 23, the upper armature bearing, and cap 14, Plate 1 ; main upper casting 7, Plate 2, and yoke castings 11, Plate 2, are held together by bolt 27, Plate 2, dividing at the dotted line.