434 



MR. J. H. BRINKWORTH ON THE SPECIFIC HEAT OF STEAM AT 



Summary of the Results. 



The following table has been drawn up to show how the observed values of S,., h, 

 and k vary with the experimental conditions. In column (2) the calorimetric 

 arrangement is briefly described. The dates in column (l) show the period of time 

 over which the experiments with each calorimetric arrangement extended. Columns 

 (3), (6), and (7) give the values of S c , h, and k. The total number of observations 

 giving the mean value S c is stated in column (4). In column (5) are the distances D 

 separating the middle of the thermometer bulb from the end of the heating coil. 

 The last two columns give the value of the heat-loss per deg. per cm. (8), and the 

 ratio of this quantity to k (9). 



(3.) 



S,. 



1912. 



April to 



June 



Non-vacuum and 

 silvered jacket 



non- 



f 2-0145 

 2-0147 



2-0143 



1912. 



Nov. to Spiral flow-tube with sil- 

 Dec. vered jacket 2-0265 



1913. 

 March to Straight flow-tube with sil 



April 



June to 

 July 



vered vacuum jacket, 

 No. 1 [_ 2-0220 

 Ditto, No. 2 2-0235 



1914. 



Feb. to Silica flow-tube, silvered 

 May non-vacuum .... 2 '0097 



Pressure in jacket about/ 

 1 mm. 



L 2-0101 



Black 



vacuum 



I" 2-0287 

 2-0284 



2-0290 

 (J 2-0298 



Extrapolated value for the specific heat S c at 104'5 C. and 760 mm., corre- 

 sponding to zero heat-loss = 2'0300 joules per gr. deg. C. 



