Siemens' drum winding
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“In order to make the winding and connections clear, one coil and the commutator is shown assembled, although the latter is not put in place until after all the sections have been wound, the ends of the wires being temporarily twisted together until all can be soldered to the risers.” — Hawkins, 1917
Source
Hawkins and Staff Hawkins Electrical Guide Number One (New York: Theo. Audel and Company, 1917) 226
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