Manchester Memoirs, Vol xlii. (1898), No. 6. 



VI. On the Mechanical Equivalent of Heat. 

 By Osborne Reynolds, F.R.S., 



Professor of Etigineering, Owens College, 



AND 



W. H. MooRBY, M.Sc, 



Late Fellow of Victoria University, and iS^i Exhibition Scholar. 



\A condensed account of the matter of the Bakerian lecture ;* 

 published under the condition of the Joule Fund, " to the honour 

 of Joule^s name."] 



Part I. 



On the method, Appliances and Limits of Error in the 

 direct determination of the Work expended in 

 raising the temperature of Ice-Cold Water to that 

 of Water Boiling under a pressure of ^8*899 inches 

 of Ice-Cold Mercury in Manchester. 



By Professor OSBORNE REYNOLDS. 



The prestige conferred on this Society by Joule's inti- 

 mate and hfelong association with it, renders it the high 

 privilege as well as the duty of all its members to foster 

 the fame of that great discoverer, and to guard with the 

 most jealous eye the memory of his work against whatever 

 may detract from the estimation in which it is held. 



With these views, the author cannot bring before this 

 Society the results of an independent determination of the 

 Mechanical Equivalent 0/ Heat without a word of explana- 



* Phil. Trans., A„ vol. 190, 1897, pp. 30T-422. 

 [The Council of the Royal Society have kindly permitted the use 

 of the diagrams, pp. 30-34, prepared to illustrate the original paper.] 



