An international system of electro-therapeutics : for students, general practitioners, and specialists . Fig. 29. A-52 DUFF. is released, whereupon the circuit is again completed and again the cur-rent passes, and I is attracted. Thus we have a succession of momentarycurrents in the primary. (See Fig. 29.) The Condenser.—This consists of sheets of tin-foil separated by di-electric sheets of paper soaked in paraffin. It is connected with the pri-mary in such a way that (1) when the primary is broken the electricity ofself-induction flows into the condenser, and so causes no spark at the in-terr
An international system of electro-therapeutics : for students, general practitioners, and specialists . Fig. 29. A-52 DUFF. is released, whereupon the circuit is again completed and again the cur-rent passes, and I is attracted. Thus we have a succession of momentarycurrents in the primary. (See Fig. 29.) The Condenser.—This consists of sheets of tin-foil separated by di-electric sheets of paper soaked in paraffin. It is connected with the pri-mary in such a way that (1) when the primary is broken the electricity ofself-induction flows into the condenser, and so causes no spark at the in-terrupter ; and (2) when the primary is made the condenser is dischargedinto it, and so causes the primary to grow very slowly, and thus greatlydecreases the spark in the secondary at making of the primary. The net result is that the currents induced in the secondary at make. Fig. 30. of the primary become very negligible compared with those produced atbreak of the primary, and so we have in effect a succession of currentsin the same direction and of very high potential. 78. Magneto-Electric Machines.—So far as the generation of a cur-rent in a coil of wire is concerned, it makes no difference whether we movethe magnet and keep the coil stationary or move the coil and keep themagnet stationary. The only thing requisite is relative motion. In a magneto-electric machine two parallel bobbins of wire, each con-taining a soft-iron core, are whirled rapidly around an axis midway be-tween them. Thus the bobbins come alternately in front of the poles ofa poweful permanent magnet, and thus the cores are rapidly magnetizedalternately in opposite directions, and so on in a circuit including boththe bobbins alternate currents are generated in rapid succession. Acommutator attached to the rotating axis reverses the currents at ELECTRO-PHYSICS. A-53 every half revolut
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectuterus, bookyear1894
