. 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 . 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
. 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 . 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 faradic equipments areassembled on a board or marble plate, and have a pair of bindingposts in common for the different currents. In Fig. 43 the double. Fig. 43.—Current selector. switch A is on contacts 1 and 2, which are connected to the batteryconductors a and 5. When the current from the faradic coil T isused, the switch A is moved to the right and placed on contacts 3and 4, which are connected by conductors c and d to the sec-ondary of coil T. N and M are in metallic contact with bindingposts S and Si. Pole Changers.—It is frequently necessary to change the polesa number of times in giving some forms of galvanic electricity. Itwould often be very inconvenient to change the electrodes every 76 PRACTICAL ELECTRO-THERAPEUTICS AND X-RAY THERAPY time a change of polarity is desired. A switch similar to the cur-rent selector is used, as shown in Fig. 44. If the illustration isstudied, it will be clearly seen that the polarity of 8 and 81 may be
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjecteye, bookyear1912
