. Practical electricity in medicine and surgery. Fig. 121. Fig. 123. resistances, rx r2 etc., as we please, and break the currententirely by moving the lever to a position between any of thebuttons. If the lever is allowed to rest on the button Bs allthe resistances are thrown out of circuit, and the current flowsfrom T2 sav, to A, through the lever-arm to £s to Tx directly. A resistance apparatus in which the changes are continuousis that known as the water-rheostat (Figs. 121 and 122), the prin- 134 PRACTICAL ELECTRICITY IN MEDICINE AND SURGERY ciplc of which depends upon a change in the sec
. Practical electricity in medicine and surgery. Fig. 121. Fig. 123. resistances, rx r2 etc., as we please, and break the currententirely by moving the lever to a position between any of thebuttons. If the lever is allowed to rest on the button Bs allthe resistances are thrown out of circuit, and the current flowsfrom T2 sav, to A, through the lever-arm to £s to Tx directly. A resistance apparatus in which the changes are continuousis that known as the water-rheostat (Figs. 121 and 122), the prin- 134 PRACTICAL ELECTRICITY IN MEDICINE AND SURGERY ciplc of which depends upon a change in the sectional area of aliquid through which the current flows. Two metallic plates(Fig. 123), A and B, are immersed in water and joined by a wire;another plate, 0, is capable of moving up and down between theplates A and B. To the latter is joined one circuit wire, and tothe two plates A and B the other circuit wire. When the plateC is pushed downward as far as it will allow, the surface ofwater through which the current passes is as great as possibl
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectelectri, bookyear1890
