. Directions for laboratory work in physiology. Physiology. EI^P'ECT OF CURRENT ON IRRITABILITY OF NERVES. 97 EXPERIMENT XIX. The Influence of the Direct Current on the IrritabiHty of Human Nerves. The plan of this experiment is to stimulate the nerves with induction shocks, and then, while the excitation con- tinues, to introduce the direct current at the same electrodes and observe the effect of the latter upon the sensory and motor effects of the Fig. 24. Apparatus for testing tlie effect of a direct current on the irritability of human nerves. G, key; F, post where current ent
. Directions for laboratory work in physiology. Physiology. EI^P'ECT OF CURRENT ON IRRITABILITY OF NERVES. 97 EXPERIMENT XIX. The Influence of the Direct Current on the IrritabiHty of Human Nerves. The plan of this experiment is to stimulate the nerves with induction shocks, and then, while the excitation con- tinues, to introduce the direct current at the same electrodes and observe the effect of the latter upon the sensory and motor effects of the Fig. 24. Apparatus for testing tlie effect of a direct current on the irritability of human nerves. G, key; F, post where current enters, and N, where it leaves the rheostadt; PP, post connected with the slider, from which current goes to mllammeter; H, slider; I, milammeter; J, commutator; K, electrodes; NN,pole on rheostadt connected with N, and receiving current returning from commu- tator; X,, secondary coil of induction apparatus; M, primarj' coil; O, key; Q, dr5' cell. Apparatus.—Use the apparatus employed in Experi- ment XVIII, and in addition connect battery and key with the automatic interrupter of the induction coil, and connect the secondary coil with commutator and one of the elec- trodes as shown in Fig. 24. X^otice that the induced cur- rent will pass through commutator, milammeter, and rheo- stadt and that the direct current will pass through the secondary coil. In other words, the direct and induced currents will flow at the same time through rheostadt, mil- ammeter, commutator, secondary coil and 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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