The London, Edinburgh and Dublin philosophical magazine and journal of science . results superior to those of any Crookes tube at the time inthe market is shown in fig. 1, in which the kathode consisted* Communicated by the Physical Society : read June 12,1696, some Experiments with Rontgens JRai/s. 163 of a number of iron wires spread out from a centre, and theantikathode, which also served as anode, was a spade-shapedpiece of iron or platinum. Another form of which manybulbs were tried was provided with an external kathode offoil, and an internal anode projecting to about the centre,terminat
The London, Edinburgh and Dublin philosophical magazine and journal of science . results superior to those of any Crookes tube at the time inthe market is shown in fig. 1, in which the kathode consisted* Communicated by the Physical Society : read June 12,1696, some Experiments with Rontgens JRai/s. 163 of a number of iron wires spread out from a centre, and theantikathode, which also served as anode, was a spade-shapedpiece of iron or platinum. Another form of which manybulbs were tried was provided with an external kathode offoil, and an internal anode projecting to about the centre,terminating in a small spade of platinum-foil as antikathode(fig. 2). This also gave good results, but was liable to be pierced Ffc. at high stages of exhaustion. With this form various experi-ments were tried as to the influence of the material of theantikathodic surface. Glass was found to work quite well,but to be more troublesome than metal. A phosphorescentenamel made by fusing together two parts of a soft lead-glasswith one part of Balmains luminous paint was also result of these experiments was to show that, contrary tothe opinion then current that the presence of much phospho-rescence or fluorescence was promotive of the production ofthe #-rays, the #-rays were most freely emitted when theconditions were such as to waste as little as possible of theirenergy in internal fluorescent effects: that in fact a metalsurface was preferable to a surface of glass, enamel, or por-celain for receiving the impact of the kathodic discharge. At about this time Mr. Jacksons perfected form of focus-tube was brought out, a tube which for photographic purposeswas found superior to any other form, and has not yet bee
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Keywords: ., bookcentury1800, bookdecade1840, bookidlondon, booksubjectscience
