A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 350
re left bare. Even with the closest possible fitting the re-sistance of the magnetic circuit is much greaterin this form of electro-magnet, owing to thesmaller permeability of the air gap at the joints,than it would be if the entire core were made or asingle piece of iron. A yoked electro-magnet… … A form of zigzag electro-magnet devised byJoule is shown in Fig. 378. The spiral char-acter of the windingproduces the alternateNorth and South polari-ties shown in the figure. Magnet, Equator of —A point ap-proximately midwaybetween the poles of astraight bar magnet, or Fig 3?8 zigzag…
Electricity · Electrical engineering
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