The London, Edinburgh and Dublin philosophical magazine and journal of science . c Vision 499 Notices respecting New Books :— J. H. Tan t Hoffs Studies in Chemical Dynamics 528 On Experiments with Eontgen Rays, by Prof. Augusto Eighi. 530Volume Measurement of an Air-Thermometer Bulb, by Walter G. Cady 530 On the Influence of Temperature on the Eefraction of Light by Metals, by C. Piilfrich 532 Index 533 PLATES. I. & II. Illustrative of Prof. A. W. Witkowskis Paper on the Thermo-dynamic Properties of Air. III. to V. Illustrative of Messrs. Frith and Rodgerss Paper on theResistance of the Electr
The London, Edinburgh and Dublin philosophical magazine and journal of science . c Vision 499 Notices respecting New Books :— J. H. Tan t Hoffs Studies in Chemical Dynamics 528 On Experiments with Eontgen Rays, by Prof. Augusto Eighi. 530Volume Measurement of an Air-Thermometer Bulb, by Walter G. Cady 530 On the Influence of Temperature on the Eefraction of Light by Metals, by C. Piilfrich 532 Index 533 PLATES. I. & II. Illustrative of Prof. A. W. Witkowskis Paper on the Thermo-dynamic Properties of Air. III. to V. Illustrative of Messrs. Frith and Rodgerss Paper on theResistance of the Electric Arc. EERATA. Page 112 (Mr. Sutherlands paper), in line 28 from top and again in line 30 fromtop, transpose the words before and after. „ 127, line 17. For the rate of convergence of the series increases in-definitely &c, read the rate of convergence of the series diminishesindefinitely &c. „ 240, line 24, for conservation of natural forces read u conservatism ofnatural forces. THELONDON, EDINBURGH, and DUBLIN PHILOSOPHICAL MAGAZINE AND JOURNAL OF [FIFTH SERIES.] JULY 1896. I. Thermodynamic Properties of A. W. Witkowski. [Plates I. & II.] Part II * Specific Heat. § 1. TN order to obtain a full knowledge of the thermo-JL dynamic properties of a homogeneous gaseous sub-stance it is indispensable to perform upon it a twofold experi-mental investigation : besides its thermometric and dynamicbehaviour the calorimetric properties ought to be studiedindependently. It is known that, in order to solve the firstpart of the problem, it is sufficient to test the thermal expan-sion of the gas under different pressures and its compressibilityat one temperature—or conversely, the compressibility atdifferent temperatures, together with the expansion under asingle pressure. This part of the problem I worked outexperimentally four years ago ; the results have been pub-lished in the 23rd volume of the Rozpraivy. In the presentpaper I intend to supplement these investig
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