AM) THE RELATION OF SPECIFIC HEAT TO ATOMIC WEICIIT. 



j i : 



specific heats. For the samples and measurement of their resistances I am indebted 

 to Professor AYRTON. 



I. Specific resistance at 177 = 275 microhms per cub. centim. Analysed 

 yielded no bismuth. Minute trace of antimony and '154 per cent, of arsenic. 



Specific heat 



09266 

 09267 



II. Good copper. Specific resistance at 177 = l'G9 microhm per cub. centim. 



Specific heat 



09274 

 09272 



Some specimens of copper to which phosphorus was added were then prepared, and 

 the specific heat compared with that of the pure metal employed in their preparation. 



Metal. Specific heat. 



,. , . 1-09265 



Pure copixjr fused in hydrogen i 



1-09234 



The same containing "002 per cent, phosphorus \ 



L'09336 



j -09347 



1-09320 



r -09870 



1-09910 



The amount of phosphorus in each specimen was carefully determined after its 

 preparation. 



Some further data as to the effect ot metallic or metalloiclal impurity are provided 



in the following results : 



Specific heat. 



Copper, pure, fused in air, possibly containing oxide. . J 



i "0938 



with -49 per cent, tin '0936 



3-29 : . . . .f-0927 



,. V0924 



6-64 f-0905 



., 1-0905 



Cadmium, pure . . . . ; j"0556 



{-0553 



with -2 per cent, of silver r0561 



. . . . . .1-0558 



"I f'0554 



1-0558 



