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418 PETER MOLB [J. S. M. P. E.
selected because a good opportunity had been afforded to observe its operation for over a year, a large number of motors of this type being used in water-taxis in Los Angeles harbor. It was also of advantage that the manufacturer's plant was located at Oakland, California, which made close contact possible when making certain changes required for the service. The engine was primarily designed for marine use, but the Hall-Scott engineers re-designed the crank case and removed the reverse gear that had been a part of the standard unit, making the engine adaptable to our requirements. /
The generator in this plant was especially designed by the Generffl Electric Company to match the power curve of the gas engine. It is very compact, weighing only 2100 pounds. The generator attains its rated voltage at 1200 rpm., and delivers 1000 amperes continuously at 1600 rpm. No difficulty has been encountered in generating 1450 amperes under the usually intermittent demands of picture production. The generator is practically flat-compounded at 1800 rpm., and performs well within the speed range noted above. The large commutator provides ample surface for brush contact. The generator is self -forced-ventilated.
The motor is mounted on a sub-frame supported on 3 points, and is connected by a flexible coupling to the generators. The job has been carefully engineered to provide accurate alignment under all operating conditions. The radiator is of the sectional type, and consists of two separate cores of six sections each, connected to headers at the top and bottom, the cores being separated by a two-inch air space ; the air is circulated through the radiator by a fan of the aeronautical type, driven by a variable-speed motor supplied with current by the main generator. By varying the speed of the cooling fan, the temperature of the water may be maintained at 180°F. at the waterjacket outlet, this temperature being correct for most efficient operation.
Since the motor was designed for marine use, it was necessary to add a centrifugal pump, so as to provide the volume of water required for radiator cooling. The engine is supplied with full-force feed lubrication with oil that is filtered and cooled to 150 degrees by a water-cooled heat interchanger.
The speed of the engine is controlled by a centrifugal governor adjustable to various speeds at the controlling panel. In addition to providing normal regulation of voltage by compounding the generator, a voltage regulator has been installed. All controls are