Manchester Memoirs, Vol. xlviii. (1903), No. %. 13 



Table IV. 



Almniniuni cylinder with hemispherical ends^ surface 

 fairly smootJi, mass approximately 104. grammes, small pro- 

 jection at one end of axis for suspension. 



Time in 



Initial 



Mass of ice 



Apparent 



(in minutes). 



temperature. 



(in grammes.) 



specific heat. 



20 



-i86-8 



37-25 



•154 



7 



-1897 



37-32 



-1515 



7 



-189-4 



37-18 



-151 



5 



-184-0? 



36-78 



-154? 



5 



-i88-o 



37-15 



•152 



5 



-187-3 



37-36 



-154 



The least consistent of these observations are those 



for the aluminium cylinder. This cylinder, for some 



reason not obvious, but perhaps simply on account of its 



comparatively large surface, carried an unusually large 



amount of liquid air into the calorimeter, and to this 



circumstance I attribute the want of agreement in the 



results shown in Table IV. 



The results shown in these tables agree very nearly with 



results obtained by the method of mixtures for the same 



specimens. The method of mixtures gave (for the slightly 



different range- i85°C to + IS^C.) the following 



numbers : — 



•089 for cast-iron, 



■083 for zinc (commercial), 



•050? for tin (commercial), 



■152 for aluminium (impure). 



