. Directions for laboratory work in physiology. Physiology. 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 Fig. 23. Ap
. Directions for laboratory work in physiology. Physiology. 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 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lombard, Warren P. (Warren Plimpton), 1855-1939. Ann Arbor, G. Wahr
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