housand At first these machines were used for the operation of pressed air have been used for many years ; these are are used, or a hundred times as many as ten years ago. now being equipped very generally with electric motors. small printing offices and for driving coffee mills, venti But this… … menters, in design as well for small roads. THREE HUNDRED HORSE POSTER TMTO-PHASE ELECTRIC MOTOR. as magnitude, may be The possibilities of the obtained by comparing electric motor in this field the illustrations of the earlier motors and locomo- Mining pumps, hoisting machines, and ventilating…
Patents · Iron · Steel · Machine · Fifty years · Tons · Years ago · Electric light · Scientific American · Cast Iron · Sewing machine · Horse power · Electric motor · Half century · Twenty years
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