The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . d of the ammonia-motor in the future. The compressed-gas system of car-propulsion offers thesame general advantages that are claimed for the storage-battery and compressed air systems—viz., absence of smoke,dirt, wires, and noise. There are two systems of gas motor-power before the public, both European—tlie Guillieronand Amrein, and the Luhrig systems. The latter is shownin the illustration. Twin engines are placed on each side ofthe car, under the seats, which run lengthwise. Fourtee
The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . d of the ammonia-motor in the future. The compressed-gas system of car-propulsion offers thesame general advantages that are claimed for the storage-battery and compressed air systems—viz., absence of smoke,dirt, wires, and noise. There are two systems of gas motor-power before the public, both European—tlie Guillieronand Amrein, and the Luhrig systems. The latter is shownin the illustration. Twin engines are placed on each side ofthe car, under the seats, which run lengthwise. Fourteenhorse-power is required for a car seating sixteen the roof are cold-water reservoirs, while the gas reser-voirs a are under the front and rear platforms. The speedcan be altered by means of a pedal under the foot of themotorman. He also operates hand-levers to throw themotors in or out of gear in stopping and starting the car. LIGHT-TRAFFIC RAIL WAV SYSTEMS. 207 The compressed gas is delivered by regulators to the motor-cylinders b, of which there are four, so that one may always Fig. LUHRIG MOTOR. be in action upon the driving-shaft c (for gas-engines onlygive out power every fourth stroke). The gas is admittedto the cylinders, mixed with a certain quantity of air, andignited, causing an expansion or small explosion of gas,which does the work, d is the driving-gear for connectingthe driving-shaft with the driving-axles e. The car illus-trated and described weighs seven and a half tons, but themaker reports that he has succeeded in reducing the weightto four and a half tons, or about the same as a trolley-carof the same capacity. The small car, which has but asingle motor, consumes thirty-five feet of gas per car mile,and the large one forty-two feet. The cylinders of the 18 208 WONDERS OF MODERN MECHANISM. larg;e car contain ninety cubic feet .of gas compressed toeight atmospheres, so that the capacity should run the carabout seventeen
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