Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892)
Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 756
RAILEOAD, ELECTRIC. 727 … of the motor enables it to be completely shut in by applying side plates, so that in actualpractice it is inclosed so tightly as to be quite free from the numerous difficulties so oftenexperienced from dirt finding its way into the working parts of a machine. The normalspeed of the armature at a…
Mechanical engineering
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