Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 499
t is made from the negative we obtaina picture like that in Fig. 576. In place of a photographic plate we may use a paper screencoated with crystals of barium-platino-cyanide. When therays fall upon this it shines with a peculiar yellow-greenshimmering light. It is said to fiaoresce. The shadow of… … Fig. 576.—From an X-ray photograph ofthe human hand. CONDUCTION OF ELECTRICITY THROUGH AIR 489 Another striking cliaracteristic of the rays is their abilityto discharge an electritieJ body. If the air is thoroughly drya well-insulated electroscope (§ 445) will hold its charge formany hours; but if…
Physics
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