An Elementary Manual of Radiotelegraphy And Radiotelephony for Students And Oper
An Elementary Manual of Radiotelegraphy And Radiotelephony for Students And Oper
John Ambrose Fleming
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In the same manner a carbon-steel junction has an unequal conductivity in the two directions. Again, a tellurium- aluminium junction is a good rectifier and also a plumbago- galena, the latter being a sulphide of lead. A junction of a copper point with a mass of molybdenite (sulphide of molybdenum) rectifies well. A contact between gold and iron pyrites also rectifies, but almost the best couple is a contact of zincite (native oxide of zinc) with chalcopyrites (copper pyrites), discovered by W.... G. Pickard, and called by him a Perikon Q 226 RA DIO TELEGRA PHY detector. This rectification cannot be due to a simple thermo- electromotive force, because the rectified current is in many cases in the opposite direction to the true thermoelectric current gene- rated by heating the junction. Goddard has suggested that it is due to a film of oxide or sulphide which is more penetrable by ions of one sign than the opposite. W. H. Eccles has assigned a thermoelectric origin to it, based on the possibly large electromotive forces due to the " Thomson " effect and Peltier effect, which occur in some of these imperfect conductors.
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