Stress and Strain on the Properties of Matter. 497 



Table II. 



Observer. 



i 



Metal. 



Formulae for the 

 thermal capacity 

 per unit mass 

 at f C. 



Mean thermal 

 capacity per 

 unit mass 



between 0° C. 

 and 100° C. 



Departure 

 per cent, 

 from the 

 mean of 



the values 

 obtained 

 by other 



observers. 





Aluminium 



•20700+ -0002304* 



•2185 





Bede 





1 



> Iron < 





•1040 + -000144* 

 •10601+ -000140* 



•1112 ] Mean. 

 •1138 y -1116 

 •1098 J 

 •1130 



|l-4 + 



Dulong & Petit 





J* German- 1 

 \ silver J 



•09413 + -0000106* 



•09466 





Bede 





> Zinc < 



- 



•08595+ -000084* 

 •09009 + -00*0075* 



■09015] Mean. 

 •09555 I -09280 

 •09270 J 

 •09383 



J 



Dulong & Petit 



Bede 



* 



1 



> Copper < 



■ 



•0892 + -000065* 

 •09008+ -000032* 



•09250] Mean. 

 •09515 I -09418 

 •09490 J 

 •09332 



T 



yo-9- 



r\ A CTT\ OH 1 i~. 



Dulong & Petit 



-iy LLi.WxJ.ii LV JL CLU 





- Silver - 





•0530 + '000027* 

 •05466+ -000044* 



•055701 Mean - 



•mli} -° 5685 



•05684 



] 



lo-o 





} M 



•0512 + -000063* 

 •05231 + -000072* 



r^^nn Mean. 

 •0o4401 



•05623/ Uo5di 

 •05591 







^Fr^ "ml lnQon 



J Plati»um-| 

 \ silver j 



•04726+ '000028* 



•04861 





Yiolle 



1 f 



|> Platinum ^ 



J I 



•0317 + -000012* 

 •03198+ -000013* 



•03230] Mean. 

 •03243 } -03274 

 •03350 J 

 •03550* 

 •03262 



U-4- 

 1 



J 





Dulong & Petit 







Lead > 





•0283 + -000036* 

 •02998 + -000031* 



•030101 



•03140/ 030/5 

 •03151 



|2'5 + 





* I have rejected this number from the mean, as it is considerably in excess of 

 those of the other observers, and is, moreover, exactly equal to that obtained by 

 Dulong and Petit between 0° C. and 300° C, a result not in accordance with the 

 experiments of Pouillet, Yiolle, or myself, who have all found the thermal capacity 

 of platinum to rise with the temperature. 



