FIG. 3. Curves I.,II., and III.-Hysteresis in Rowley Blue No. 2, Rowley Dolerite No. 2, and Dattenberg No. 1. Phil. Mag. Ser. 6, Vol. 7, Pl. I. FIG. 6. Curves IX., X., and XI.-Dattenberg bars No. 1 (2nd & 3rd heatings); No. 2 (1st heating.) 4. 6 8 400 2 4 6 8 500 2 4 6 8 600 2 4 6 8 700 2 Curves XII. Dattenberg, Nos. 3, 4, & 5. Curves with rising temperature only. 004 006 FIG. 4. Curve IV.-Rowley Blue No. 1. Tenth heating. Curves XIII. and XIV. - Rowley Dolerite No. 1 (1st heating) and No. 2 (2nd heating). Curves V., VI., VII., VIII.-Rowley Blue No. 2, 1st, 3rd, 5th, & 6th heatings. K. 010 008 40 006 30 6 8 300 2 4 6 8 400 2 4 6 8 500 2 4. 6 8 600 2 4 6 8 700 50 004 201 008 V THE LONDON, EDINBURGH, AND DUBLIN PHILOSOPHICAL MAGAZINE AND JOURNAL OF SCIENCE. [SIXTH SERIES.] FEBRUARY 1904. XI. The Effect of Temperature on the Ionization produced in Gases by the Action of Röntgen Rays*. By R. K. MCCLUNG, M.A. (McGill), B.A. (Cantab.), Trinity College, Cambridge, 1851 Exhibition Science Scholar" +. DURING 66 Introduction. URING the course of an investigation on the effect of temperature on the rate of recombination of gaseous ions, the results of which appeared in a previous paper ‡, some preliminary experiments were made to see what effect the temperature of the gas had upon the amount of ionization produced in it. These preliminary experiments gave results which were at variance with some experiments of Prof. Perring published in 1897. It was therefore considered advisable to make a fresh investigation of this subject. The results of this investigation are given in the present paper. These experiments were carried out in order to ascertain whether a change in the temperature of a gas has any effect upon the amount of ionization produced per unit volume by the action of Röntgen rays of a given intensity, and if so to determine in what way the ionization is affected by the temperature. This was tested by the method usually employed in testing ionization under different conditions, namely, by * A preliminary account of some of these experiments was published in the Proceedings of the Cambridge Phil. Soc. vol. xii. pt. 3, May 1903. + Communicated by Prof. J. J. Thomson. t Phil. Mag. Dec. 1903. Annales de Chimie et de Physique, xi. p. 496 (1897). Phil. Mag. S. 6. Vol. 7. No. 38. Feb. 1904. G |