“Salient pole, bipolar field magnet with single coil wound around the yoke.” — Hawkins, 1917
Hawkins and Staff Hawkins Electrical Guide Number One (New York: Theo. Audel and Company, 1917) 200
2400×2077, 617.3 KiB
1024×886, 77.2 KiB
640×553, 40.6 KiB
320×276, 15.8 KiB