Die London, Edinburgh und Dublin philosophische Zeitschrift und Zeitschrift für Wissenschaft. rof. J.Zeleny auf Luft, die 100 Prozent elektrifiziert, zwischen der Leitfähigkeit der Schicht 7*49 mm. dick und ein 1* 135 mm. dick. Ich denke, dass das, was ist notaccounted Für durch Polarisierung von unevennessand Unreinheit des Platten erklärt werden kann. Abschließend möchte ich Prof. J.J.Thomson für hiskind Ermutigung danken, die während dieser Untersuchung. o o o XXIX. Auf Luft elektrisiert von der Entladung Aktion ofUltra-violettes Licht. Durch JoHtf Zelent, B.Sc., AssistantProfessor der Physik, Universität von Minnesota *. rr^ER fol

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The London, Edinburgh and Dublin philosophical magazine and journal of science . rof. J. Zeleny on Air Electrified by the 100 per cent, between the conductivity of a layer 7*49 mm.thick and one 1*135 mm. thick. I think that what is notaccounted for by polarization can be explained by unevennessand uncleanliness of the plates. In conclusion, I wish to thank Prof. J. J. Thomson for hiskind encouragement during this investigation. o o o XXIX. On Air Electrified by the Discharging Action ofUltra-violet Light. By JoHtf Zelent, B.Sc, AssistantProfessor of Physics, University of Minnesota*. rr^HE following experiments were made to compare some ofJL the electrical properties of air into which a body isbeing discharged by the action of ultra-violet light, withthose when Rontgen rays are the cause of the discharge. The apparatus was arranged as is shown in the figure. Tis a brass tube. At M it is joined by a lead cylinder whichcontains on the inside an insulated metal tube filled withglass wool G, which latter is connected to a pair of quadrantsof the electrometer E. EARTH.. 3 c A The light of an arc lamp A was concentrated by the quartzlens L, and after passing through the quartz window P fellupon the freshly cleaned, negatively charged, zinc plate D. If air was blown into the apparatus at C, it passed by D, through G, and out at R. When now the air was at restand the light was turned on, or when the air was blown throughwhile the light was cut off, the glass wool at G received nocharge. But if both the light and air-blast were in action, * Communicated by Prof. J. J. Thomson, F.R.S. Discharging Action of Ultra-violet Light. 273 the electrometer showed that G was receiving a negativecharge. The deflexion increased continuously until it passed offthe scale. When, however, another plug of glass wool was introducedinto the tube at B, no charge whatever reached G, showingthat here also, as with gases charged under the action ofRontgen rays (J. J. Thomson and E. Rutherford, Phil.

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• bookcentury1800
• bookdecade1840
• booksubjectscience
• bookyear1840