Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 450
and leaving them stronger, and thespeed of the motor immediately becomes slower. This is a very 848 ELEVATORS 35 nice device and does its work automatically and is quite reliable.The idea of weakening or strengthening the fields of a motorto gain or lessen speed is almost as old as the first… … Fig. 23. (D) Wiring Diagram of Controller with Solenoid Cut-outs. however, is one where a separate dynamo is used for supplying thefields and one for the armature. A field regulator connected withthe dynamo supplying the fields can be placed in the cab, by meansof which the. operator can weaken or…
Architecture · Building · Carpentry
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