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 456
. The insulating segments are made of some hard material capa ble of being polished and formed with sharp edges . Such mater ials as glass , marble , or soapstone may be advantageously used . The metal segments are preferably of copper or brass ; but they may have a facing or edge of durable… … Fig . 251 Fig . 252 . ing of the parts . In this modification the commutator and col lector are made in substantially the same manner as previously described , except that the bands b c are omitted . The four seg ments of each part , however , are secured to their respective sleeves by screws g ' g…
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