A 



JOURNAL 



OF 



NATURAL PHILOSOPHY, CHEMISTRY, 



AND 



THE ARTS. 



SEPTEMBER, 1806". 



^ ARTICLE I. 



Inquiries concerning the Mode of the Propagation of Heat in 

 Liquids. By Benjamin Count of Rumford, F.R.S. 

 Read at the National Institute of France, 9t^i June, 1805. 

 Translated by W. C a dell. 



JL HE motions in fluids which result from a change in their Motion of 

 temperature, give rise to so great a number of phenomena, "' ^ ^ ^^ ' 

 that philosophers cannot bestow too much pains in investiga- 

 ting that interesting branch of knowledge. 



When heat is propagated in solid bodies, it passes from par- Passage of 

 tide to particle, de proche en proche, and apparently with thSg^^j^jg "'"^^ 

 same celerity in every direction ; but it is certain that heat is 

 not transmitted in the same manner in fluids. 



When a solid body is heated and plunged in a cold hquid, An heated so- 

 the particles of the liquid in contact with the body being rare- jJeat*!fiiqu[(i 

 f.ed by the heat that they receive from it, and being rendered downwards, 

 specifically lighter than the surrounding particles, are forced to 

 give place to these last and to rise to the surface of the liquid ; 

 and the cold particles that replace them at the surface of the hot 

 body, being in their turn heated, rarefied, and forced up; all 

 the particles thus heated by a successive contact with the hot 



Vol. XIV.— September, 1806. • Zz body 



