Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1076
-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 RINGCORE, WITH EIGHTY BAR COMMUTATOR. FOR DIRECT CURRENT volutions of phosphor-bronze wire in sizes varying fromNo. 20 up to 14, laid on tightly over a mica insulation andsweated with solder all the way round. Eeferring to 443 it will be…
