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XIII. On the Specific Heat of Steam at Atmospheric Pressure between 



104' C. and 115 C. 



by the Continuous Flow Method of Calorimetry performed in the 

 Physical Laboratory of the Royal College of Science, London?) 



By J. H. BKINKWORTH, A.R.C.S., B.Sc., Lecturer in Physics at St. Thomas s Hospital 



Medical School. 



Preface by H. L. CALLENDAR, M.A., LL.D., F.R.S., Professor of Physics at the 

 Imperial College of Science and Technology, London, S.W, 



Received April 1, 1915, Read May 13, 1915, 



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THERMOMETER 



PREFACE. 



THE conclusion of Mr. BRINKWORTH'S experiments on the specific heat of steam at 

 atmospheric pressure in the neighbourhood of 105 C. marks a definite stage in an 

 investigation which has been in progress with 

 varying success for the last twenty years. It 

 may therefore be of interest to review the 

 situation in the light of collateral evidence which 

 has been accumulating from various quarters 

 during the progress of the research. 



The investigation originated from some experi- 

 ments undertaken in conjunction with the late 

 Prof. J. T. NICOLSON, at McGiLL College in 

 1895, " On the Law of Condensation of Steam" 

 (published in ' Proc. Inst. C.E.,' 1898), in the 

 course of which it was necessary to observe 

 repeatedly the wetness of the steam employed. 

 The special form of throttling calorimeter, shown 

 diagrammatically in fig. 1, was employed for this 

 purpose. The sample of steam, taken from the 

 steam-pipe, was throttled through a thin tube of 



EXIT 

 THROTTLE 



EXHAUST 



Fig. 1. 



small bore, in order to eliminate the error due to conduction of heat through the 

 throttle, to which most forms of throttling calorimeter then in vogue were liable. 



VOL. CCXV. A 535. 3 F [Published September 21, 1915. 



