An Elementary Manual of Radiotelegraphy And Radiotelephony for Students And Oper

Cover 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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