A manual of practical medical electricity : the Röntgen rays and Finsen light . o tion coil are that the alternations of his current are in-conceivably rapid, and the E. M. F. exceedingly the alternations produced by a good induction coilmaybe about 200 per second, and the E. M. F. from 500 144 A Manual of Practical Medical Electricity to 20,000 volts ; while the alternations of the current usedby Tesla vary from about half a million to ten or moremillions per second, and the E. M. F. from 100,000 to amillion or more volts. To produce these effects, Tesla makes use of an alter-nating
A manual of practical medical electricity : the Röntgen rays and Finsen light . o tion coil are that the alternations of his current are in-conceivably rapid, and the E. M. F. exceedingly the alternations produced by a good induction coilmaybe about 200 per second, and the E. M. F. from 500 144 A Manual of Practical Medical Electricity to 20,000 volts ; while the alternations of the current usedby Tesla vary from about half a million to ten or moremillions per second, and the E. M. F. from 100,000 to amillion or more volts. To produce these effects, Tesla makes use of an alter-nating current dynamo with a stationary armature aboutthirty inches in diameter, and provided with about 380coils. A thin disc of iron carrying 380 magnets connectedin series,|.and driven by a motor at 2,000 revolutions,. Fig. 90.—Dr. Spamers Induction Coil, generates a current of more than 13,000 alternations persecond. This current is passed through an inductioncoil of high insulation (oil), in the circuit of the secondarywire of which is a battery of Leyden jars, which, by theoscillating character of their discharge, produce the enor-mous frequency of alternations. Similar effects on a humble scale may be produced andstudied by means of the following apparatus (ElihuThompson). To the secondary terminals of a large Ruhmkorffscoil (my own gives a ten-inch spark) are attached thick, High Potential Electricity 145 well-insulated wires, the one of which passes to the knobof a medium-size Leyden jar, and the other to its outercoating. The first wire is now carried on to terminate inthe knob of a metal discharger ; the second onejs__coiled
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectro, bookyear1902
