Archive image from page 114 of Directions for laboratory work in Directions for laboratory work in physiology directionsforlab1906lomb Year: 1906 ricsponse; of human nerves to direct current. 91 EXPERIMENT XYlll. Stimulation of Human Nerves by Direct Current. Apparatus.—The electric current of the University is used. (Study diagram). It flows through 4 lamps, (which let amps, pass) and then is shunted round 4 more lamps, and has at the terminals A and F, a voltage of 220/2 iio volts. It then passes through 2 lamps A and B, (which let amps, pass) and is shunted round 3 lamps, C, D, a
Archive image from page 114 of Directions for laboratory work in Directions for laboratory work in physiology directionsforlab1906lomb Year: 1906 ricsponse; of human nerves to direct current. 91 EXPERIMENT XYlll. Stimulation of Human Nerves by Direct Current. Apparatus.—The electric current of the University is used. (Study diagram). It flows through 4 lamps, (which let amps, pass) and then is shunted round 4 more lamps, and has at the terminals A and F, a voltage of 220/2 iio volts. It then passes through 2 lamps A and B, (which let amps, pass) and is shunted round 3 lamps, C, D, and £, and has a voltage at the terminals N and P, of 3 X 110/5 = 66 volts. Fig. 23. Apparatus for stimulation of human nerves by a direct current. A, B, C, D, E, F, binding posts in second bank of electric lamps used to cut down the voltage; G, key; P, post where current enters, and N, where it leaves rheo- stadt; PP, post connected with slider, from which current goes to milamme- ter; H, slider; I, milammeter; J, commutator for reversing current; K, elec- trodes; NN, pole on rheostadt connected with N ind receiving current returning from commutator. In the rheostadt it is again shunted, the current passing through the resistance from P to A and a portion of it heing led off through the metal slider (H) to the arm cir- cuit. The resistance is equivalent to the German silver wire of the rheocord used in Experiment XVII. The slider is con- nected with the post PP. which gives the branch of current to the arm circuit, and the current returns from this circuit
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