. Carnegie Institution of Washington publication. A RESPIRATION CALORIMETER. copper wall. The length of the wooden cylinder and of the wires is such that when one end is thus inserted in the thimble the junctions at the other end are exactly in the plane of the zinc wall. The element is held in place by a cork firmly inserted in the outer aperture of the ring in the zinc wall. The ends of the two long German-silver wires that lead to the junctions are passed through holes in the cork, which are far enough apart to insure insulation between the two German- silver wires, and likewise far enough
. Carnegie Institution of Washington publication. A RESPIRATION CALORIMETER. copper wall. The length of the wooden cylinder and of the wires is such that when one end is thus inserted in the thimble the junctions at the other end are exactly in the plane of the zinc wall. The element is held in place by a cork firmly inserted in the outer aperture of the ring in the zinc wall. The ends of the two long German-silver wires that lead to the junctions are passed through holes in the cork, which are far enough apart to insure insulation between the two German- silver wires, and likewise far enough from the edge of the cork to in- sure insulation between these wires and the copper ring soldered into the zinc wall. The ends of the thermal junctions are far enough below. Fig. 26. Fig. 27. Fig. 28. FIG. 26.—Thermo-Electric Element. Iron wires (represented by black line) and German-silver wires are soldered with silver solder, making a series of four junctions at each end. FIG. 27.—Thermo-Electric Element Mounted on Wooden Rod. The iron and German-silver wires are pressed well into slits in the sides. The two projectirg wires are for connections. FIG. 28.—Method of Installing the Therrno-E'ectric Elements in the Metal Walls. A short tube soldered in the zinc wall holds the element in place. the outer surface of the wooden cylinder to prevent any possible elec- trical contact with either the copper thimble on the copper wall or the ring on the zinc wall, while the small air-gap does not seem to retard unduly the passage of heat from the copper or zinc wall to the junc- tions. In this position a junction is able to take up rapidly at each end the temperature of the corresponding metal wall. The detection of differences in temperature between the two metal walls by means of the thermal junctions thus inserted depends upon the fact that if the ends of the two kinds of wire forming the junction are unequally heated a current of electricity is developed, the intensity of. Ple
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