. Kirkes' handbook of physiology . Fig. 315.—Du Bois Reymonds Key. acid which is being used up. The copper-sulphate solution is renewed by crystals of thesalt, which are kept on a little shelf attached to the copper plate and slightly below thelevel of the solution in the vessel. The current of electricity supplied by this cell willcontinue without variation for a considerable time. Other cells, such as the dry cell(which, however, is adapted to open-circuit work) may be used in place of Daniells. The. Fig. 316.—Mercury Key. way in which the apparatus is arranged is to attach wires to the copp
. Kirkes' handbook of physiology . Fig. 315.—Du Bois Reymonds Key. acid which is being used up. The copper-sulphate solution is renewed by crystals of thesalt, which are kept on a little shelf attached to the copper plate and slightly below thelevel of the solution in the vessel. The current of electricity supplied by this cell willcontinue without variation for a considerable time. Other cells, such as the dry cell(which, however, is adapted to open-circuit work) may be used in place of Daniells. The. Fig. 316.—Mercury Key. way in which the apparatus is arranged is to attach wires to the copper and zinc plates, andto bring them to a key, connecting the wires of the battery. One often employed is DuBois Reymonds, figure 315. It consists of two pieces of brass about an inch long, in eachof which are two holes for wires and binding-screws, to hold them tightly. These piecesof brass are fixed upon a vulcanite plate to the under surface of which is attached a screw APPARATUS USED TO PRODUCE MUSCLE CONTRACTION 445 clamp by which it can be secured to the table. The interval between the pieces of brasscan be bridged over by means of a third thinner piece of similar metal fixed by a screw toone of the brass pieces, and capable of movement by a handle at right angles, so as to touchthe other piece of brass. If the wires from the battery are brought to the inner binding-screws, and the bridge connects them, the current passes across it and back to the are connected with the ou
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