The London, Edinburgh and Dublin philosophical magazine and journal of science . working, in two or three seconds, or while only a few cubiccentimetres of mercury pass through the pump, the pheno-menon changes. The luminosity behind the antikathode diesout, and that in front of the antikathode increases; so thatthere is seen simply a bright anterior region ending at theoblique plane of the antikathode, beyond which all is dark(fig. 5). This oblique delimitation can also be seen in the. yellow phosphorescence upon the walls of the bulb. Thissudden transition occurs after the resistance of the b
The London, Edinburgh and Dublin philosophical magazine and journal of science . working, in two or three seconds, or while only a few cubiccentimetres of mercury pass through the pump, the pheno-menon changes. The luminosity behind the antikathode diesout, and that in front of the antikathode increases; so thatthere is seen simply a bright anterior region ending at theoblique plane of the antikathode, beyond which all is dark(fig. 5). This oblique delimitation can also be seen in the. yellow phosphorescence upon the walls of the bulb. Thissudden transition occurs after the resistance of the bulb haspassed its minimum. The brightest luminescence occurswhen the spark-length exceeds 40-50 millimetres. The lumi-nosity does not fall off* much even at very small angles to theplane of the antikathode, proving that the emission of ar-rays does not follow Lamberts law of the cosine by anymeans, Experiments on this point are still in progress, 166 Some Experiments until Rontgens Rays, 5. The phenomenon of diselectrification by #-rays is veryreadily demonstrated. For this purpose I have found a veryconvenient instrument to be an electroscope consisting oftwo strips of aluminium leaf (which is lighter than gold leaf)suspended in a thin-glass jar entirely covered with a finemetal gauze. It is charged with a dry pile, and a metalcap is then placed over the charging knob, so that it isentirely electrostatically screened from external electricalinfluences. Positive and negative el
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Keywords: ., bookcentury1800, bookdecade1840, bookidlondon, booksubjectscience
