The inventions, researches and writings of Nikola Tesla : with special reference to his work in polyphase currents and high potential lighting (1894)
Martin, Thomas C, Tesla, Nikola · The Electrical Engineer · leaf 461
tener . In Fig . 257 instead of a solenoid , an iron tube inclosing a coil is shown . The piston of the coil is attached to both brush - holders a a and c . When the brushes are moved directly by electrical devices , as shown in Figs . 256 and 257 , these are so constructed that the force exerted… … Fig . 255 . helices receive the entire current through the auxiliary brush or brushes , and these brushes could not be taken off without break ing the circuit through the field . These brushes cause , move - over , heavy sparking at the commutator . In the present case the auxiliary brush causes…
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