6H. 



ANNALS '. 



OW 



PHILOSOPHY. 



FEBRUARY, 1821 



Article I. 



^Researches into the Mathematical Principles of Chemical Phiio^ 

 sophy. By J. B. Emmett. 



{Continued from vol. xvi. p. 358, First Series.) 



Hull, Dec. 28, 1820. 



Radiation of Caloric. 



When a mass of matter is placed in a heated medium, it, for 

 a definite length of time, is receiving heat ; i. e. each particle, as 

 well as the entire mass, by prop. 6, cor. and prop. 11, by attract* 

 ing the surrounding caloric, becomes encompassed by a calorific- 

 atmosphere, which is of uniform density in each part of the 

 concentric strata, and which is more dense than the atmosphere 

 which is produced by exposure to a medium of lower tempera^, 

 ture ; during this time, the surrounding medium experiences a 

 diminution of temperature in those parts which are in the vicinity 

 of the cold mass, which diminution of heat continually decreases^ 

 and the body arrives at the precise temperature of the surround- 

 ing medium, which then becomes uniform in all its parts. The 

 reason why the temperature of the body and of the medium are 

 uniform, although the caloric is more dense in those parts 

 which are near the mass of matter than in the more remote, is 

 evident ; for by temperature is to be understood the tendency 

 which caloric has to escape, or its sensible elastic force : now 

 the increased elastic force of a calorific atmosphere, arising from 

 its increased density, is in part counteracted and opposed by its 

 tendency to the attracting body, and the pressure of all thi* 

 superior strata; its sensible elasticity must be precisely the 



New Series, y Oh. I, f ♦ -^ 



