The Emission of Positive Ions from a Fresh wir of Nickel-Chromium Group, Heated in the Atmosphere
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概要
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In a horizontal brass tube of length 17.8 ems. and internal diameter 1.6cm, a piece of calido wire, 0.4m.m. diameter, which was renewed for each test, was stretched with a slight but sufficient tension and a steady emf of dry cells was opplied between the two, with the negative terminal connected to the tube. If a heating current was sent through the wire, a positives ionic current began to flow from the wire to the tube electrode.If the temperature of the wire and the applied voltage were kept constant, the current increased gradually at first and then more rapidly and began to decay after reaching a maximum. The higher the temperature within the range of the test-namely from 900 to 1260°C, or the higher the voltage from 40 to 223 volts, the shorter was the time required for the current to reach the maximum.For a series of tests of constant voltage and different temperatures, the maximum current was the largest from the wire at about 1000°C and smaller at higher or lower temperatures. For lower temperatures say 970°C and 935°C, the current-time curves, however, accompanied another hump before reaching the larger maximum above mentioned.For a test of constant temperature and different voltages, the maximum current was larger, the higher the voltage applied.Characteristic curves thus obtained showed very regular forms and variations as compared with previously published results of platinum and other metals. The results were examined by pointing on. some particular features, although their explanations are not clear as is generally the case for positive emissions.
- 一般社団法人 電気学会の論文
一般社団法人 電気学会 | 論文
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