Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 1082
c-tion with Fig. 426. Fig. 441 shows the construction of theGramme ring, so named from the inventor, Gramme. Thewinding is on a ring coil made up of soft iron punchings25 mils thick. The wires on the outer surface are active,having electro-motive force induced in them, and called ar-mature… … Fig. 442 eight section eighty coil ring winding on a smooth ring core, with eighty bar commutator. for direct current volutions of phosphor-bronze wire in sizes varying from■No. 20 up to 14, laid on tightly over a mica insulation andsweated with solder all the way round. Eeferring to 443 it will be…
