Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 750
equipment in 361 working days. The cost bymules averaged sixty-five dollars per day whilethe cost by air-haulage was only twenty-three dol-lars per day, for the same output. These compressed-air locomotives are built ina great variety of styles and weights. Some aremade of a three-ton capacity;… … THI^. CoMPRKSSED-AIR ENGINE RUNS THROUGH A ILNM^LONLY THIRTY-TWO INCHES HIGH. distances, a trailer-tank is taken in tow to rein-force the air-supply. The air-compressors are stationary machinesdriven by any available power. The pressureobtained is from 700 to 2500 lbs. per square inch,according to…
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