. Electricity in diseases of the eye, ear, nose and throat . Pig. 37.—Wehnelt Electrolytic Interrupter With Heavy Plati-num Anodes Connected in Parallel and Used for Instantaneousand Tele-radiography. further passage of the current. As the bubbles_ ofhydrogen escape into the surrounding electrolite,the current is again established. The circuit is thusmade and broken very rapidly. See Figure 37. TRANSFOKMEES. 57 A transformer is usually an induction coil, bywhich a primary current of high initial electro-mo-tive force is made to produce a secondary current oflow initial electro-motive force. Th
. Electricity in diseases of the eye, ear, nose and throat . Pig. 37.—Wehnelt Electrolytic Interrupter With Heavy Plati-num Anodes Connected in Parallel and Used for Instantaneousand Tele-radiography. further passage of the current. As the bubbles_ ofhydrogen escape into the surrounding electrolite,the current is again established. The circuit is thusmade and broken very rapidly. See Figure 37. TRANSFOKMEES. 57 A transformer is usually an induction coil, bywhich a primary current of high initial electro-mo-tive force is made to produce a secondary current oflow initial electro-motive force. This is a step-down transformer. Fig. Pig. 38. A step-up transformer transforms a current oflow electro-motive force into a current of highelectro-motive force. The term transformer is also applied to a de-vice by means of which alternating currents arechanged into continuous ones and vice versa. SINUSOIDAL APPARATUS. In the modern type of apparatus, designed forthe production of currents having a sinusoidalwave, there is little to remind one of the shockingmachine of our fathers,—a coil of wire revolvedbetween the poles of a permanent magnet. About twenty years ago the designers of elec-trical machinery called attention to the shape of the 58 ELECTRO-THERAPEUTIC APPARATUS. wave as a factor in tlie design of apparatus and theeffects of the current produced; and it is to Edison,I believe, that the introduction of the sine wave intothe domain of therapeutics is due. The first appa-ratus was capable of affording waves of a fixedperiodicity only, later types enabled the rate to bevaried and afforded currents suitable for a
Size: 1506px × 1660px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjecteye, bookyear1912
