[Bubier], Edward Trevert, 1858- [from old catalog] · Lynn, Mass., Bubier pub. co. · leaf 163
er to take out and replace one coilwithout disturbing the others. As in the case of drum armatures, a safe calcula-tion is I volt for every 2 feet of active wire. Verysmall machines are not so efficient as large ones.Acore 7 inches in outside diameter, 5 inches in- RECENT APPLICATIONS. 161 side,… … A field magnet of style of Fig. 1 or 8 would besuitable. By using wire of one-half the size and mak-ing twice as many turns, a four pole field (Fig. 9)could be used. Twelve pounds of No. 12 wirewould be sufficient for the field spools. The sameshunt winding as used for the drum armaturewould serve…
Electricity
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