ON THE HEAT DEVELOPED IN COMBUSTION. 



125 



The following table will show the specific gravity of each, 

 and the quantity of pure alcohol of Lowitz and of water con- 

 tained in it. 



Liquid. 



Alcohol of 42° 

 Alcohol of the shops 

 Spirit of wine of 33° 



Spec, grav- 

 at60°F. 



8 17624 

 847140 



853240 



Composition 

 Pure alcohol 

 of Lowitz. 



0-9179 

 0-8057 



0-7788 



Water 



0*0821 

 0-1943 

 0-2212 



The following ai\* the results of the experiments made to Results 

 ascertain the quantities of heat, which these liquids fur- 

 nished iti burning. — 



In three experiments made with the spirit of wine the J t ' t« 

 quantities of heat manifested were, 



in the ._ 



water raised rrora the temperature 



:in°:ice to that of ebullition. 



1st, 53-260") ' ; 



I lbs of wate 

 2d, 5L727 > P u - 



I of melti 



3d, 52*604 ) 



The mean result is 52-604 lbs*. 



As a pound of this li'quid contained but 0*7788 of the 

 alcohol considered by Lowitz as pure; the other part, -s 

 0-2212, being only water, which does not burn; to find 

 how much water would be raised from the temperature 

 of melting ice to that of ebullition by a pound of the pure 

 alcohol of Lowitz, we have only to divide the quantity, 

 that is the measure of the mean heat developed in the ex-^ 

 periments with the spirit of wine by the fraction, that ex- 

 presses the quantity of alcohol in a pound of this liquid. 



52-604 



67-545 lbs, the measure of the 



Thi 



ha\ 



0-7788 



heat developed in the combustion of one pound of pure 

 alcohol of Lowitz, according to the mean result of the ex- 

 periments made with spirit of wine. 



In two experiments made with the alcohol of the shops, wk 

 the mean result was 54*218 lbs: and, as this contained ne ' 



* As the mran of the three preceding numbers would be 52-530, 

 there is evidently some mistake; and the last number of the three 

 being the same with the mean given, it is probable, one of these is an 

 erroui' of the transcriber But, as the number 52 604 is employed 

 as the mean \a the calculation in the next paragraph, it may be pre- 

 sumed, that the result of the third experiment shout 1 have been 

 $2 825. C. 



0-8057lb 



the 



