Royal Society. 



391 



pound of water continues in the liquid state, and how much of 

 the energy developed is possessed by that liquid water. 



Table II. 



Initial temperature. 

 Fahrenheit. 



Proportion of the 



water which remains 



liquid. 



Pound, 



Energy possessed 

 by that liquid water. 



Foot-pounds. 



212 

 248 

 284 

 320 

 356 

 392 

 428 



about 

 2360 



1000 

 0-964 

 0931 



0-897 

 0-865 

 0-835 

 0-806 











700 



2587 



5429 



9015 



13215 



17858 







In the formula? and Tables, it has not been considered neces- 

 sary to take into account the small increase which the specific 

 heat of water undergoes as the temperature rises. — W. J. M. It. 



LVIII. Proceedings of Learned Societies. 



ROYAL SOCIETY. 



[Continued from p. 321.] 



March 5, 1863. — Major- General Sabine, President, in the Chair. 



'T^HE following communication was read : — 

 -*- " On the Change of Form assumed by Wrought Iron and other 

 Metals when Heated and then Cooled by partial Immersion in Water." 

 By Lieut.-Col. H. Clerk, R.A., F.R.S. 



Origin of the Experiments. — A short time ago, when about to 

 shoe a wheel with a hoop-tire, to which it was necessary to give a 

 bevel of about fths of an inch, one of the workmen employed sug- 

 gested that the bevel could be given by heating the tire red-hot and 

 then immersing it one-half its depth in cold water. This was tried, 

 and found to answer perfectly, that portion of the tire which was 

 out of the water being reduced in diameter. The tire was 3 inches 

 wide, \ inch thick, and 4' 2" in diameter. 



As this result was curious and not generally known, I considered 

 it desirable to institute some further experiments in order to try how 

 far, by successive heatings and coolings, this change of form could be 

 augmented, and also whether the same effect could be produced on 

 other metals than wrought iron. 



Mode of carrying out the Experiments. — The experiments were 

 made on cylinders of wrought iron of different dimensions, both 



