. The medical and surgical uses of electricity. . nd of the cylinder on the left, very high resistance carbonblocks are introduced into the circuit, making the total resistance about33,000 ohms. This rheostat is regulated by the sliding contact whichtravels along the two rods above and parallel with the cylinder. APPARATUS FOR ELECTRO-THERAPEUTICS. 281 A i6 C. P. lamp is placed in circuit with each of the leading-in wiresto effectually protect the patient and apparatus, should a short circuitoccur on any part of the electric-light circuit. A third lamp, shown on the extreme right, provided wit
. The medical and surgical uses of electricity. . nd of the cylinder on the left, very high resistance carbonblocks are introduced into the circuit, making the total resistance about33,000 ohms. This rheostat is regulated by the sliding contact whichtravels along the two rods above and parallel with the cylinder. APPARATUS FOR ELECTRO-THERAPEUTICS. 281 A i6 C. P. lamp is placed in circuit with each of the leading-in wiresto effectually protect the patient and apparatus, should a short circuitoccur on any part of the electric-light circuit. A third lamp, shown on the extreme right, provided with a key, is ar-ranged in shunt with the rheostat. When the key is turned on, the vol-tage of the galvanic current is reduced to 60 volts. With this shunt inoperation, and all the resistance of the rheostat thrown into the circuit, bymoving the sliding contact to the extreme left, a current of one milli-ampere is obtained when the binding posts are connected together by ashort piece of wire, , short-circuited. On moving the sliding contact to. Fig 67—Portable Diy Galvanic Battery (Vetter). the right, the resistance is very gradually diminished, and the current cor-respondingly increased. This finely graduated current is required in somecases, where a very slight irregularity in the current would produce ashock to the patient. When a stronger current is required, the lamp is cut out by turning offthe key and the current is used unshunted. The Kennelly milliammeter is mounted on the base on the left, thepole-changing switch is placed in the middle of the board, while on theright is shown the faradic coil, which is also operated by the street cur-rent. The converters or adapters of Mcintosh, Vetter, and others are allpractical and efficient. In Fig. 71 is illustrated a method of employing the constant incandes- 282 ELECTRO-THERAPEUTICS. cent current for cataphoresis, electrolysis, and the ordinary purposes ofthe galvanic current. In the use of the four devices here illustrate
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1896
