. Hand-book of electro-therapeutics . interrupter. did not register for about three minutes, and no current was , suddenly, the meter registered IS milliamperes and theauthors arms were violently jerked. The current was turned offand another trial was made, when the current suddenly jumped Fig. 19.—Hard riibber needle holder. to 20 milliamperes. The wire rheostat is always to be preferred,notwithstanding the statements of enthusiastic salesmen. In selecting a wire rheostat we should be sure that it has anample heat-radiating surface. In a carbon rheostat, the carbonheats too quickly a
. Hand-book of electro-therapeutics . interrupter. did not register for about three minutes, and no current was , suddenly, the meter registered IS milliamperes and theauthors arms were violently jerked. The current was turned offand another trial was made, when the current suddenly jumped Fig. 19.—Hard riibber needle holder. to 20 milliamperes. The wire rheostat is always to be preferred,notwithstanding the statements of enthusiastic salesmen. In selecting a wire rheostat we should be sure that it has anample heat-radiating surface. In a carbon rheostat, the carbonheats too quickly and, besides, becomes unevenly distributed. Fig. 20.—Hemorrhoidal needle holder. thus giving at one point too great resistance and at another toolittle, thus producing an unequal resistance. The voltage andamperage may both be controlled and regulated by placing alimit resistance at the point of entrance of the current; thecurrent is then shunted by means of a resistance cylinder, whichis placed in the main circuit. GALVANISM. 37. Fig. 21.—Needle holder, Mith magnifying glass.
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