. Medical electricity; a practical treatise on the applications of electricity to medicine and surgery. wregulates the excursions of the hammer or the rate of itsvibrations. This constitutes an automatic interrupter. Itis contained in the circuit of the primary coil. Its mode ofaction is as follows: When the circuit is closed, the softiron core of the bobbin is at once rendered magnetic, andattracts the hammer to it, and in so doing breaks the cir-cuit at the platina-tipped screw; at once the iron is demag-netized, and the spring draws the hammer back by its ownresiliency; then again the circu
. Medical electricity; a practical treatise on the applications of electricity to medicine and surgery. wregulates the excursions of the hammer or the rate of itsvibrations. This constitutes an automatic interrupter. Itis contained in the circuit of the primary coil. Its mode ofaction is as follows: When the circuit is closed, the softiron core of the bobbin is at once rendered magnetic, andattracts the hammer to it, and in so doing breaks the cir-cuit at the platina-tipped screw; at once the iron is demag-netized, and the spring draws the hammer back by its ownresiliency; then again the circuit is closed, the soft iron isao-ain magnetized, the hammer attracted, and thus thereensue regular interruptions. The steel spring is alsocalled the trembler, from the rapidity of its the platina-tipped screw is intended to regulate 70 ELECTRO-PHYSICS. the number of interruptions, it does so to a very limitedextent; the vibrations of the spring are very rapid, and canbe but slightly diminished The hammer of the faradicapparatus invented by the Galvano-Faradic Company, of ii j2 t3. E O 7— J-. +-< H -2 •« | d « c H aJ ^ S 6 o . tn lt, ^- o i» r-a £ °js c > G ?-- o ° S s o a. 0 New York, plays in a fork which enables the operator toregulate the interruptions to any extent (Fig. 39). In thefaradic instrument of Flemming, of Philadelphia, the same ELECTRO-MAGNETISM. end is attained by a mechanical arrangement for regulatingthe rapidity of the interruptions. In an instrument pro-vided with this arrangement, distinct contractions andrelaxations of the muscles operated on can be obtained,whilst by the other hammer the interruptions are so rapidas to keep the muscles in a state of tonic contraction. A temporary magnet is also used for securing interrup-tions of the hammer, instead of the screw and core of theprimary coil. The mechanism of the construction of a faradic batterywill be more readily comprehended by reference to theseinstructive diagrams
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectro, bookyear1887
