. Practical electro-therapeutics and X-ray therapy : with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray . e machine. A rheostat that will allow the current to come onunevenly or by jerks is dangerous, and should never be used forany purpose. There are several good machines on the market, andthere is no excuse for using defective apparatus. The rheostat shown in Fig. 40 is made of small German silverwire carefully wound about a nonconducting hoop, each turn beingcarefully insulated from its fellow, and offering a high degree of re-sista
. Practical electro-therapeutics and X-ray therapy : with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray . e machine. A rheostat that will allow the current to come onunevenly or by jerks is dangerous, and should never be used forany purpose. There are several good machines on the market, andthere is no excuse for using defective apparatus. The rheostat shown in Fig. 40 is made of small German silverwire carefully wound about a nonconducting hoop, each turn beingcarefully insulated from its fellow, and offering a high degree of re-sistance to the passage of the current. The coil is well inclosed bya metal case that thoroughly protects it from dust and dirt. Thearm supporting the contact shoe moves easily around the circuit,allowing the resistance to be changed in such small quantities asto be entirely free from unpleasant sensations. 74 PRACTICAL ELECTRO-THERAPEUTICS AND X-RAY THERAPY SWITCH-BOARD. The electric switch-board used by the physician is usually calleda wall or table plate. It usually contains a milliamperemeter,rheostat, rheotome, faradic coil, current selectors, pole changers,. Tig. 45.—Physicians switch-board or wall plate. binding posts, etc., and it may be arranged for the cautery and sin-usoidal currents. Fig. 45 is a simple diagram of a physiciansswitch-board or wall plate. A is the milliamperemeter; B, rheo- CONTROLLING AND MEASURING APPARATUS 75 stat; C, rheotome; D, faradic coil; E, current selectors; F, polechanger; G, binding posts for electrodes. No one should attempt to use a wall plate until perfectly familiarwith every switch and current, and the physician should knowjust what the apparatus will do and how to make it do it. There are no two makes of plates exactly alike in their arrange-ment, though in principle they are the same. When one designhas been thoroughly mastered, all others will be easy. CURRENT SELECTORS AND POLE CHANGERS. Current Selectors.—Most galvanic and faradi
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjecteye, bookyear1912
