Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 441
akingthe circuit and for closing it, makingsuitable connections to the armatureleads to cause the motor to run in thedirection required. This switch is soarranged that Mhen the circuit isclosed, it releases an arm or a cross-head that drops by gravity and there-by cuts out the resistance in… … Fig. 13. Controller for MechaniaiOperation,
Architecture · Building · Carpentry
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