. X-rays simply explained : a handbook on Röntgen rays in theory and practice . => CI. HISTORICAL AND EXPLANATOKV 25 two coiiipdiienls, one jicliiij^ vtilically downwardsand prohahly i)roducing heat and tluoroscence, theolhiT l)eing partly expended in pro(hicing rapidrotational movement in the disc. A most beautifulai)pearance results from previously dividing the discinto quadiauts painted with ditlerent fluorescentminerals, which cause qui\ering and shifting coloursuntil the rotation becomes so rapid that they blend. Heating Effect.—liecent researches scarcely leaveroom for the old theory
. X-rays simply explained : a handbook on Röntgen rays in theory and practice . => CI. HISTORICAL AND EXPLANATOKV 25 two coiiipdiienls, one jicliiij^ vtilically downwardsand prohahly i)roducing heat and tluoroscence, theolhiT l)eing partly expended in pro(hicing rapidrotational movement in the disc. A most beautifulai)pearance results from previously dividing the discinto quadiauts painted with ditlerent fluorescentminerals, which cause qui\ering and shifting coloursuntil the rotation becomes so rapid that they blend. Heating Effect.—liecent researches scarcely leaveroom for the old theory that these eflects were dueto the direct mechanical impact of molecular oratomic masses moving at high velocities; it ispro])able that the forces result from heat generatedby the impact of the rays and acting upon thevanes as it does in its radiant form in a Crookesradiometer. The magnitude of the heating effect is strikinglyillustrated by a tube made as shown in fig. 4, PlateI. The cathode is a large cup of aluminium, whichacts in accordance with the following principles:— It has
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