. The London, Edinburgh and Dublin philosophical magazine and journal of science . ns University, Baltimore. * The results of this investigation have since heen published in thePhys. Rev., Dec. 1898, p. 257. [ 46 ] II. On the Thermal Conductivity of Water. By S. R. MlLNER,, 1851 Research Scholar, and A. P. Chattock, Pro-fessor of Physics, University College, Bristol*. A KNOWLEDGE of the thermal conductivities of liquidsis of value in relation to their chemical constitution ;and as the comparison of conductivities may be more easilymade than the determination of their absolute values, it is
. The London, Edinburgh and Dublin philosophical magazine and journal of science . ns University, Baltimore. * The results of this investigation have since heen published in thePhys. Rev., Dec. 1898, p. 257. [ 46 ] II. On the Thermal Conductivity of Water. By S. R. MlLNER,, 1851 Research Scholar, and A. P. Chattock, Pro-fessor of Physics, University College, Bristol*. A KNOWLEDGE of the thermal conductivities of liquidsis of value in relation to their chemical constitution ;and as the comparison of conductivities may be more easilymade than the determination of their absolute values, it is ofimportance that the absolute conductivity of some standardsubstance, such as water, should be known as accurately aspossible. The present paper is the account of an attemptmade to measure this quantity by the direct determination ofthe quantities entering into its definition ; the heat flowing-through the water being generated electrically f, and soaccurately measurable. The principle of the method will bebest understood by reference to the diagram, fig. 1. Here the Fig-. ■Halancing curre/x—^Beatiny current water (shaded) forms a thin layer between the plane parallelbottoms of the vessels A and B. Over the bottom of A(which must be constructed of thin glass or some bad con-ductor to prevent horizontal flow of heat) is a flat coil orzigzag D of well-insulated wire which forms the heating-coil/ and the wires of which are shown in section by the dottedline. The heat generated in D when traversed by a currentflows downwards through the water layer into the sink C (a * Communicated by the Authors, having been read at the BristolMeeting of the British Association, 1898. t At the time of designing our apparatus we were unacquainted withthe work of Dr. C. H. Lees, who also makes use of an electrical methodof generating heat for conductivity measurements (see Brit. Assoc. BeportEdinburgh, p. 647, also a later paper, Phil. Trans. 1898, p. 399). Exceptin this particular, howeve
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