A manual of practical medical electricity : the Röntgen rays and Finsen light . An ordinary galvanic battery of from ten to forty cells(if possible of large size), Leclanche or Hellesen ; ifStoehrers battery, or if Bunsen cells be used, a smallernumber will suffice. A milliampere meter, rheophores,and needles ; the latter may be of platinum, steel, or gold ;they should be insulated, except close to the point, so asto avoid destroying the skin. Coxeter makes a con-venient form of needle-holder for fastening the needles Jones has devised a bipolar fork electrode (Fig. 120)so arranged that
A manual of practical medical electricity : the Röntgen rays and Finsen light . An ordinary galvanic battery of from ten to forty cells(if possible of large size), Leclanche or Hellesen ; ifStoehrers battery, or if Bunsen cells be used, a smallernumber will suffice. A milliampere meter, rheophores,and needles ; the latter may be of platinum, steel, or gold ;they should be insulated, except close to the point, so asto avoid destroying the skin. Coxeter makes a con-venient form of needle-holder for fastening the needles Jones has devised a bipolar fork electrode (Fig. 120)so arranged that several needles alternately positive and Electro-Surgery 227 negative can be screwed into it. By this means the needlescan be kept at equal distances from each other, and cannotcome into contact, however moved about. Two assistantsare required, the one to administer an anaesthetic, andthe other to watch the milliampere meter and manipulatethe cell-collector. All being in readiness, the needles, if separate, are intro-duced one by one with a slight twisting motion, and the. Fig. 120.—Lewis Jones and other Epilation Needles. current turned on, and gradually increased to from 6o7ta100 The assistant should watch the galvanometer carefullyto prevent any short-circuiting from the needles accident-ally meeting in the naevus ; this would be indicated by asudden great increase in the current-strength, and isremedied by slightly displacing the various needles untilthe short circuit be broken. As the current passes, the tissues round the needleschange in appearance and texture ; bubbles of gas areformed round the negative needles, and the tissues softenand swell; a hardening and contraction occur round the 15—2 228 A Manual of Practical Medical Electricity positive needles. The skin around the nasvus becomeshyperaemic. As the tissues are seen and felt beneath thefinger to change, the needles should be one at a timewithdrawn, and reinserted in other parts, so as to dis-tribute t
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectro, bookyear1902
