The Philosophical magazine; a journal of theoretical, experimental and applied physics . ed in photometric pursuits; and by theuse of the same quantities of a similar solution, exposed in a likemanner in various countries, valuable tables might be con-structed. [ 94 ] XVII. On the Rotation of Holloio Spheres of Metal by G. Gore, Esq.^ IN the Supplementary Number of the Philosophical Magazine,June 1858 (see also the Number for February 1859), Idescribed an apparatus for producing rotation of tubes and hol-low spheres of metal by means of heat of electric conduction-resistance, the movin
The Philosophical magazine; a journal of theoretical, experimental and applied physics . ed in photometric pursuits; and by theuse of the same quantities of a similar solution, exposed in a likemanner in various countries, valuable tables might be con-structed. [ 94 ] XVII. On the Rotation of Holloio Spheres of Metal by G. Gore, Esq.^ IN the Supplementary Number of the Philosophical Magazine,June 1858 (see also the Number for February 1859), Idescribed an apparatus for producing rotation of tubes and hol-low spheres of metal by means of heat of electric conduction-resistance, the moving body being placed upon a horizontalmetallic railway, and the heat being produced by passing a pow-erful electric current from one rail through the ball or tube tothe other by means of their points of mutual contact. Since that period I have further considered the conditions ofthe phtenomenon referred to, and have constructed the followingapparatus for producing similar motion by means of ordinaryheat. A and A, fig. 1, is a massive circular ring or railway, com- Fig. 1. (Scale ^th.). posed of metallic copper f, and cast in one piece (seen in section,fig. 2j ; the outer rail. A, is 10 inches in diameter, and the innerone. A, is 6 inches; the height of the outer rail is 1^ inch,and that of the inner one is y^oth of an inch less; the distance * Commuiiicated by the Author. t The ring contained a little brass in its composition, to enable it to bemore readilv melted and cast. On the Rotation of Hollow Spheres of Metal by Heat. 95 between their edges is 1| inch, and they each taper from a sharpedge at the top to about |ths of an inch thick at the edges of the rails are turned perfectly true and smooth*, andin some instances have been coated thickly with silver by electro-deposition in order to protect the copper at those parts fromoxidation when subjected to a high temperature, but with unsa-tisfactory results; the greater expansibility of the silver causedit to separate
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