. Medical electricity; a practical treatise on the applications of electricity to medicine and surgery. r H, vibrating be- ELECTRO-MAGNETISM. 73 tween the core and the screw. P, P are the primary poles,and S, S the secondary. When the current from E passesthrough the screw Sc, the hammer H is attracted to thescrew, and the circuit through the coil from B to A is com-plete. At this moment the soft iron in the interior is mag-netized, and then the hammer H is attracted to the ironand the circuit is broken. At every interruption, currentsof induction start in the secondary coil C, D, and inductio
. Medical electricity; a practical treatise on the applications of electricity to medicine and surgery. r H, vibrating be- ELECTRO-MAGNETISM. 73 tween the core and the screw. P, P are the primary poles,and S, S the secondary. When the current from E passesthrough the screw Sc, the hammer H is attracted to thescrew, and the circuit through the coil from B to A is com-plete. At this moment the soft iron in the interior is mag-netized, and then the hammer H is attracted to the ironand the circuit is broken. At every interruption, currentsof induction start in the secondary coil C, D, and inductiontakes place between the turns of the coil, thus reinforcingthe primary current, the poles of which are at P, P. Induc-tion also occurs between the turns of C, D, thus reinforcingthe secondary current, the poles of which are at S, S. The current thus produced, which Faraday calledthe extra current, is collected in some of the modernfaradic instruments and made to do duty as the primarycurrent. The current induced in the secondary coil isalso, as has just been stated, increased by induction Fig. ^ii^ ? Improved Du Bois Reymond coil This coil is provided with slow and rapid inter-rupters, with switch for making connections with the primary and secondary current, andwith governing screw for regulating the tension of the current. between the coils. Hence it follows that, if theseaccessory currents be cut off from the main ones, thestrength of the latter would be correspondingly is accomplished by a movable cylinder, which is 74 ELECTRO-PHYSICS. pushed in or out when it is desired to increase or diminishthe strength of the applications. In many of the foreign instruments—Du Bois Reymonds,for example—the secondary coil is made to slide over theprimary, so that very nice gradations in the strength of thesecondary current can be effected (Fig. 43). CHAPTER VI MAGNETO-ELECTRICITY. By the passage of galvanic electricity through a coil ofinsulated wire, the magnet
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectro, bookyear1887
