Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 128
wire, so as to enable the weak current to produce asgreat a magnetising effect as possible upon the core, and itsparts are very delicately constructed, so that a very smallforce is sufficient to move it. In the simplest forms ofrelay the armature is of soft iron, just like that of theelectro-magnet… … Fig. 29. condition by means of permanent magnets fixed in theirimmediate neighbourhood. Polarised relays are affectedby the direction of the current, and they can be mademuch more sensitive than the non-polarised ones. For thisreason the latter instruments are very seldom used in thiscountry. The…
Electric industries · Electricity
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