Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 974
tingdevice 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- Electric Elevators 939 structed to secure the motor against damage by any over-load, or excess of current; these features… … Fig. 3S6 OTIS LEVER CAR SWITCH Electro magnets are employed throughout, thereby elim-inating the use of all rheostats, sliding contacts, or othereasily deranged devices. The contacts and wearing partsin the controlling mechanism are of ample dimensions tomeet the severe conditions, and exacting…
