Text Appearing Before Image: 238 TISSUE CURRENTS. Requirements the same as before, and couple the wires from the electrodes to the terminals of the electrometer. The latter is set ujd on a dark room, and consists of a bracket on the wall of the glass tube drawn to a fine Text Appearing After Image: Fig. 47. G Galvanometer. L Lamp and scale. H Shunt. C Commutator with leading-in terminals in circuit, with E Non-polarisable electrodes. P Paraffin block supporting a muscle, the nerve of which rests on platinum electrodes S connected to S circuit of inductorium. 1. Non-polarisable electrode. C China clay point on glass tube S containing saturate zinc sulphate solution. Z Zinc rod (amalgamated) corked into place. 2. Diagram of capillary electrometer. C Glass tube with capillary end, con- taining mercury (black), dipping into 1 in 10 sulphuric acid A. E Wires of platinum in the electrometer, attached to "leading-off" electrodes. There is an arrangement for exerting pneumatic pressure on the mercury in C to adjust its position in the capillary. The mercury moves in the direction of the negative pole. The electro- meter is substituted for the galvanometer and shunt in the first arrangement by attaching its wires to the commutator C. capillary end, in which there is mercury, and which dips into a small trough containing 10 p-c- H2S04. There is a small pool of mercury in the latter also. The terminal wires dip into the mercury in each case.
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