. The Philosophical magazine; a journal of theoretical, experimental and applied physics . Such supports are, in spite of their cost, of so great utility,especially in a humid climate, that a cheaper substitute ofequally high insulation is a desideratum. In the electricallaboratory of University College, Bristol, insulating supportsof the type about to be described are found of very great use. A piece of combustion-tube, about 20 centim. long and 1*4centim. diameter, is fused together at one end, and the closedend is slightly enlarged by blowing, and then slightly flattenedat its extremity. Th
. The Philosophical magazine; a journal of theoretical, experimental and applied physics . Such supports are, in spite of their cost, of so great utility,especially in a humid climate, that a cheaper substitute ofequally high insulation is a desideratum. In the electricallaboratory of University College, Bristol, insulating supportsof the type about to be described are found of very great use. A piece of combustion-tube, about 20 centim. long and 1*4centim. diameter, is fused together at one end, and the closedend is slightly enlarged by blowing, and then slightly flattenedat its extremity. This tube, which forms the central support, * Communicated by the Physical Society ; read December 8,1883. t Proc. Hoy. Soc. June 1867, and Reprint of Papers on Electrostaticsand Magnetism, p. 322. See also the figure given on page 14 of Max-wells Elementary Treatise on X Journalde Physique, t. vii. p. 217(1878); Nature, xviii. p. 44 (1878);see also Wiedemanns Elect ri.
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