. The Philosophical magazine; a journal of theoretical, experimental and applied physics . I would remark that in advancing fromcoils of l-ohm to coils of higher values we have followed thesuggestion made by Lord Rayleigh in 1881, of passing bythree threes plus one to ten, and three thirties plus ten to onehundred. We have, however, found it much more convenientnot to use the ingenious but complicated system of mercury-cups suggested by Lord Rayleigh for facilitating this of this we have employed the following simpler holes are drilled in a block of paraffin for me
. The Philosophical magazine; a journal of theoretical, experimental and applied physics . I would remark that in advancing fromcoils of l-ohm to coils of higher values we have followed thesuggestion made by Lord Rayleigh in 1881, of passing bythree threes plus one to ten, and three thirties plus ten to onehundred. We have, however, found it much more convenientnot to use the ingenious but complicated system of mercury-cups suggested by Lord Rayleigh for facilitating this of this we have employed the following simpler holes are drilled in a block of paraffin for mercury-cups. 270 Mr. G. Kamensky on the Electric Conductivity The holes have sheet-copper disks fixed at the cup is large enough to admit of the insertion of threestout copper terminals. Figures 1 and 2 below show how thearrangements are made for connecting the three threes inparallel, for verification, and for connecting the three threesplus one in series, when using them for testing a 10-ohm both figures the letter c denotes a connecting bar of stoutcopper. Fig. Fig. 2. y^\r^_ c c My thanks are due to my assistant, Mr. Colman C. Starling,Demonstrator in Physics in University College, Bristol, forhaving zealously aided me in working out the methods ofadjustment described above. XXXI. Note on the Electric Conductivity and other Propertiesof the Copper-Antimony Alloys. By Geokge Kamensky,Assoc. Royal School of Mines*. IT is remarkable that the physical constants of the alloys ofcopper and antimony have hitherto been but little ex-amined, more especially as the series is a very striking one ;and the so-called Regulus of Venus, which was well knownto the alchemists, stands out prominently, with its beautiful • Communicated by the Phvsical Society, having been read June 23,3883. and other Properties of the Copper-Antimony Alloys. 271 violet colouring, both from the rest of the copper-antimonyseries and from the alloys of other metals. As a typical set to wo
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