Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · 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. 386otis 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…
