1 8 SCHMITZ, On a Method of Ice Calorimetry. 



The error due to included water also depends on the 

 shape of the object. A spherical or well-rounded shape is 

 favourable both to consistency and lowness of results. 

 The following numbers for two leaden cylinders, suspended 

 with axis vertical, and weighing respectively 64 J and 129 

 grammes, taken in conjunction with the above numbers 

 for spheres, illustrate this statement : — 





Apparent specific heat. 



Shorter cylinder 

 Longer cylinder 



•0318 (mean of "0319 and •0317). 

 ■03075 (mean of "0309 and •0306). 



In the case of lead, results closely agreeing were 

 obtained with the objects described in the following 

 table : — 





Apparent specific heat. 



Sphere weighing 141 grammes 



Cylinder with rounded ends weighing 

 246 grammes 



Plummet with tapering rounded base 

 weighing 286 grammes 



•0304 

 •0303 



•0303 



•0303 

 •0304 

 •0303 



This agreement seemed to show that the results could 

 not be far from the truth. They were however consider- 

 ably in excess of the result obtained by the method of 

 mixtures ('02935). The only likely explanation of the 

 discrepancy seems to be that the error due to the included 

 water has not really been eliminated. 



On account of its smaller specific heat, lead tests the 

 capabilities of the method more severely than the metals 



