Archive image from page 110 of Directions for laboratory work in Directions for laboratory work in physiology directionsforlab1906lomb Year: 1906 KI'SPONSE OF NERVE TO DIRECT CURRENT. EXPERIMENT XVII. Response of Nerve upon Closing and Opening the Direct Battery Circuit with Currents of Various Strengths. Apparatus.—Use the ordinary apparatus for recording muscle contractions. Introduce a rheocord into the circuit used in the last ex- periment, making connections as in- dicated in Fig. 22. Mount a pair of n o n - p o larizable electrodes, in the moist chamber, connecting the wires so that th
Archive image from page 110 of Directions for laboratory work in Directions for laboratory work in physiology directionsforlab1906lomb Year: 1906 KI'SPONSE OF NERVE TO DIRECT CURRENT. EXPERIMENT XVII. Response of Nerve upon Closing and Opening the Direct Battery Circuit with Currents of Various Strengths. Apparatus.—Use the ordinary apparatus for recording muscle contractions. Introduce a rheocord into the circuit used in the last ex- periment, making connections as in- dicated in Fig. 22. Mount a pair of n o n - p o larizable electrodes, in the moist chamber, connecting the wires so that the current will ascend the nerve. Observe that the current passes down the fine German silver wire of the rheo- cord to the slider and there divides, part going to the nerve and part go- ing through the lower part of wire. At the double post at bottom of wire the two streams of the current imite again and pass togeth- er to the battery. Observe that the current traversing the nerve must increase as the slider is moved upward, because the resistance in the wire beyond the point where the circuit divides is increased. Fig. 22. Method of using rheocord. A, german silver wire; B, slider; C, double binding post at lower end of german silver wire; D, battery; E, key; E, nerve bridging the boot electrodes, the current being ascending.
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