. The London, Edinburgh and Dublin philosophical magazine and journal of science. d appears to be much more pro-nounced. Although I am not in a position to publish now all theresults of my experiments, I think I may state, in conclusion, thatthe phenomena produced in the couples, and the actions producedin the interpolar circuit, may be completely explained by a cal-culation of the vires vivse destroyed and the motive force produced. XXXV. Note on a C. Hocktn, * THE little apparatus shown in figs. 1 and 2, arranged by and myself, p-„ j was lately exhibi
. The London, Edinburgh and Dublin philosophical magazine and journal of science. d appears to be much more pro-nounced. Although I am not in a position to publish now all theresults of my experiments, I think I may state, in conclusion, thatthe phenomena produced in the couples, and the actions producedin the interpolar circuit, may be completely explained by a cal-culation of the vires vivse destroyed and the motive force produced. XXXV. Note on a C. Hocktn, * THE little apparatus shown in figs. 1 and 2, arranged by and myself, p-„ j was lately exhibited at the Royal (Scale one-tenth of the natural size.)Institution. The object of theapparatus is to show the identityof the conducting-power of themetals for heat and for electri-tricity. In fig. 1 we have anumber of glass bulbs withtubes attached dipping into acoloured solution, forming aseries of electrical air-thermo-meters. In each bulb is fixedone of the wires to be ends of these wires are sol-dered to thick copper wires pass- * Communicated by the 300 Mr. C. Hockin on a Lecture-Experiment. ing through the corks which stop the tubes, aud then througha stout upright board so as to support the bulbs. Of the thickwires, one from each tube is soldered to one thick copper wire,and the other to another thick wire. These last wires are con-nected with the poles of a battery of one or two large Grovescells. The current then divides itself, and a portion flows througheach wire proportional to the con ducting-power of that current heating the wire causes the air in the bulb to ex-pand and depress the liquid in the tube attached by an amountnearly proportional to the con ducting-power of the wire. If thetubes were filled at first to the top, the liquid will, when thecurrent is flowing, fall through different amounts. Fig. 1 showsthe curve when the wires are gold, silver, and various alloys ofgold and silver. If the connexions are changed so that the
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