Transactions of the American Electrochemical Society Volume 20
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...however, would be of sufficient interest to warrant further investigation. The Nernst glower is not suitable to use for these experiments, for the range of temperature over which it can be operated is too limited. N0 more suitable material could be found than the ductile tungsten wire made in this laboratory. In an atmosphere of hydrogen this wire can be heated to temperatures above 3oor' C. for considerable periods of time. Furthermore, because of its very high temperature coefficient of electrical resistance, its temperature can be measured with considerable accuracy. Experiments with Tungsten Wire in Hydrogen. The tungsten wire was suspended in the axis of a vertically placed glass tube of 4 cm. internal diameter, down through which a stream of very pure electrolytic hydrogen was made to flow. The hydrogen was purified by passing it through two furnaces containing copper gauze, then dried over sulphuric acid and phosphorus pentoxide, then passed through a tubefilled with paladium asbestos heated to 300 C., and finally dried again over phosphorus pentoxide. The wire was held at the upper end by a clamp, and the lower end was fastened to a heavy piece of platinum wire, which dipped into a small cup containing mercury in order to furnish electrical connection with a copper wire entering the lower end of the tube. The lengths of tungsten wire used ranged from 5 to 50 cm., and wires of four different diameters, 0.229, 0.069, 0.045, 0.028 mm., were studied. A good many experiments were also made with tungsten wires placed horizontally, bent into loops and placed in vessels of various shapes and sizes. Two methods were used in determining the temperatures of the wire. First, where the temperature was sufficientlx high a direct...
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