124 



with the 

 strongest. 



Mean for nure 

 al'.ohol : 



•cnropared 

 •*itb its com- 

 joaeilt parts. 



ON THE HEAT DEVELOPED IN COMBUSTION. 



©•8057 lb. of pure alcohol, we have for the measure of the 

 heat developed in the combustion of lib of pure alcohol 



— - — - == 67*294 lbs of water heated 180° F. 

 0-S"57 



Of three experiments made with the alcohol at 42" the 

 mean result was 6 1*952 lbs. of water heated 180°F. by 

 the heat developed in the combustion of one pound of this 

 liquid. 



Hence lib of pure alcohol should furnish heat enough in 



bttrnisff to raise 67"57 lbs of water 180° F. ; for zz 



a 0-9179 



67*57*. 



Taking the mean between the results of these eight ex- 

 periments with three alcoholic liquors, we shall have for the 

 measure of the heat developed in the combustion of one 

 pound of pure alcohol of Lowitz 67*47t lbs of water raised 

 from the temperature of melting ice to that of ebullition. 



It will be extremely interesting, no doubt, to know whe- 

 ther this quantity of heat agree with the quantities of com- 

 bustible matter (carbon and hidrogen) in alcohol. We will 

 see. 



According to the analysis of Mr. de Saussure, lib of 

 the alcohol of Lowitz contains 



Carbon » 0-4282 



Free hidrogen 0*1018 



Water 0*4700 



The ealewla- 

 r.«n from 



Csawfofd 1 . 



Now according to the calculations of Dr. Crawford we 

 shall have for the measure of the heat developed in the 

 combustion of 



0*4289 lb of carbon • • • • 24*667 lbs of water heated 1 80° F. 

 0*1018 lb of hidrogen •• 41738 



Total 66-405 



and the to The experiments gave us 67*47t 



* If the mean result were as given above, which I hare no rricansof 

 knowing, as the results of the\experinients are omitted, this should be 



67-499. C. 



•f If the correction in the preceding note were to be made, this 

 should be 67444. C. 



It 



