Manchester Memoirs, Vol. xlviii. (1903), No. 3. 11 



The lowest temperature of the liquid air in my obser- 

 vations was— 191 o^'C. My practice was to observe the 

 temperature half a minute or a quarter of a minute before 

 the extraction of the piece of metal. 



The temperature of the piece of metal some seconds 

 after its extraction from the bath of liquid air is of course 

 not precisely that of the liquid air, but, as already stated, 

 I do not think that the difference is at all an important 

 one. 



Consistency of Results. 



The results shown in the following tables were obtained 

 after many preliminary experiments of various kinds with 

 pieces of metal of various shapes and sizes. Each table 

 gives all the experiments made with the piece of metal in 

 question. These experiments (except the last two on 

 aluminium) were made without using the ice-tray described 

 on page 7. The transference to the calorimeter was 

 effected as rapidly as possible (except again in the case of 

 the last two experiments on aluminium). 



Table I. 



Cast-iron ball, surface moderately rough, mass iio'^^ 

 grammes, iron hook for suspension. 



Time in 









calorimeter 



Initial 



Mass of ice 



Apparent 



(in minutes). 



emperature. 



(in grammes). 



specific heat. 



7 



-183-4 



22-50 



-0888 



7 



-183-8 



22-53 



•0887 



5 



1 



-i86-o 



2272 



•0884 



