234 SEC. 8. HEAT. 



Jj. It is free from all danger of ignition or explosion 4 

 4. It is the least expensive volatile liquid. 



This machine turns out 12 kilogrammes of ice per kilogramme of coal con 

 suined. 



1085. Apparatus for Freezing Water, constructed by 

 Mr. Bieberich. Compare the adjoined instruction for use. 



University of Munich (Prof. v. Jolly). 



1086. Small Ammonia Ice Machine. 



Vaast and Littmann, Halle. 



VI. CONDUCTION. 



1087. Model of Circular red hot Copper Railway, for 



causing a metal ball to rotate by means of unequal expansion by 

 heat. George Gore, F.E.S. 



Model in wood of circular railway, which when formed of copper heated to 

 redness, and a thin cold ball of German-silver placed upon it, the ball rotates 

 by the influence of unequal expansion produced by the heat. ( See Philo- 

 sophical Magazine, August 1859). 



1088. Forbes 9 Iron Bar for Thermal Conductivity, with 

 its crucible. Professor Tait, Edinburgh. 



1088a. Apparatus by Peter von Musschenbroek, n 



Dutch mathematician (born 1692, died 1761), to determine the 

 relative values of the Coefficients of the Expansion of Solid 

 Bodies. Professor Dr. P. J. Rijke, Leyden. 



1089. German Silver Bar, of same size, cast for same 

 purpose. Professor Tait, Edinburgh. 



1090. M. Fizeau's Apparatus for measuring the Co- 

 efficient of Dilatation. 



Conservatoire des Arts et Metiers, Paris. 



1090a. Three Original Bars, by Depretz, on which were 

 made the studies of the Laws of Conductibility. 



The Faculty of Sciences, Paris. 



1090b. Original Apparatus of Regnault for the Dilata- 

 tion of Gases. College of France, Paris. 



1091. Depretz's Apparatus for showing the Conduction 



of Heat in metals with 9 thermometers. 



JVarmbrunn, Quilitz, and Co., Berlin. 



