Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 968
device the current is automatically and gradually admittedto the motor, enabling the operator to start and stop thecar without shock or jar. This controlling device is con- car Electric Elevators 939 structed to secure the motor against damage by any over-load, or excess of current; these features…
