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PROFESSOR W. A. TILDEN ON THE SPECIFIC HEATS OF METALS, 



stream of air was blown by means of bellows across the mouth of this vessel at the 

 moment at which the cold tube was brought over it, and the metal dropped. 



After reading the thermometer the calorimeter and its contents were weighed. 

 The metal was previously weighed separately. All the weighings were reduced to a 

 vacuum. 



The following results were obtained : 



Experiments at the temperature of solid carbon dioxide were carried out in a 

 similar manner. The holder containing the metal was thrust into a cavity scooped 

 out of a large mass (originally 50 pounds) of compact solid carbon dioxide, and the 

 space between the inner and outer tubes was packed with the same. The apparatus 

 remained in contact and surrounded by the solid for half-an-hour. The uniformity 

 of the results which follow seems to prove that the metal had acquired the tempera- 

 ture of the cold mass. 





