. The Philosophical magazine; a journal of theoretical, experimental and applied physics . ls of oneor more seconds. With all precautions, the discharo-es areoften too strong for perfect purity of electro-optic action, pro-ducing large disturbances in the liquid, and givino- rise in alittle time to intense heat-effects. There are several liquids(ethyl alcohol, distilled water, &c.) which have given goodresults by this method only. 2. The Fusion-cell, a small instrument similar to the platecell, but adapted to higher temperatures, is represented in theadjacent diagram. The shaded piece is a squ
. The Philosophical magazine; a journal of theoretical, experimental and applied physics . ls of oneor more seconds. With all precautions, the discharo-es areoften too strong for perfect purity of electro-optic action, pro-ducing large disturbances in the liquid, and givino- rise in alittle time to intense heat-effects. There are several liquids(ethyl alcohol, distilled water, &c.) which have given goodresults by this method only. 2. The Fusion-cell, a small instrument similar to the platecell, but adapted to higher temperatures, is represented in theadjacent diagram. The shaded piece is a square of plate glass, half an inch 02 156 Di- J. Kerrs Electro-optic thick, with a square space worked out of it as shown in thetio-ure. In contact with this frame, and covering its two faces,are two panes of thin plate glass, Avhich are kept closely andfirmly united to the frame by a small metallic press. Theconductors in the coll are twoballs of brass, electroplated withplatinum, and attached each to a stiff wire, which passesupwards through an insulating tube of glass. These tubes. are supported by a stand (shown in the figure). The cell andstand are placed on an iron tripod, and enveloped by a widemuffle of sheet iron, with an aperture at the top for the longconductor, and two apertures at the sides for transmission ofthe light. Under the floor of the tripod is an Argand gas-burner, which supplies a current of hot air to the interior ofthe muffle. In the course of some preliminary experiments on the fatsand waxes, the fusion-cell was found to be not nearly so deli-cate as the plate cell, both instruments working under ordinaryconditions—the former at high temperatures, the latter at the Experiments on various Liquids. 157 temperature of the laboratory. The conditions of experimentwith the fusion-cell are always in some degree unfavourable ;so that a moderately strong effect obtained with this instru-ment may be accepted safely as an evidence of high electro-optic power in t
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