CALORIMETER. iG? 



neral, however, they are less fusible, and more soluble in 

 alcohol than any of the bodies mentioned above. It appears 

 then, upon the whole, that palm-oil differs essentially in its 

 physical and chemical properties from any substance that has 

 hitherto been made the subject of experiment. Its fusibility 

 is nearly similar to that of animal fat, while, in its chemical 

 properties, it more nearly resembles the resins, at the same 

 time that it differs from those bodies in not being soluble in 

 nitric acid. 



Liverpool, Feb. 1 4-, 1807. 



II. 



Description and Use of a Calorimeter or Apparatus for dcier- 

 fnirii?ig the Degree of Heat, as well as the Economy attending 

 the Use of various kifids of Fuel. .'By M. Montgolfier. 



HE proper use of fuel is one of the most important objects Advantages of 

 in all the processes of the Arts, and more especially in Che- economy, &c. 



• . ^ • 1 • • 1 • r •, •!.. 1 in fuel. 



mical Operations; and it is an object ot no less utility, (o de- 

 termine the advantage and economy attemling the uses of the 

 various descriptions of fuel and the intensity of heat disengaged 

 from the sub>tances burned. 



The same quantity of combustible matter of different kinds Different corn- 

 does not always afford the same degree of heat, and a longer in their efFectsi 

 or shorter portion of time will be required to disengage it from ' 

 each combustible respectively. The success of an operation 

 frequently depends on the rapidity with which it can be per- 

 formed. Manufacturers, distillers, and cultivators must there- 

 fore consider it as an object of great importance to know what 

 kind of fuel may be the cheapest for use, and what may be the 

 proportion of a given quantity of the one compared with the 

 same quantity of another, with regard to the effect to be 

 derived from each ; or, in short, what may be the most certain 

 and easy method ofdetermining the difference of the action of 

 heat. The editors of the Journal des Mines speak with appro- 

 bation of Mr. Montgolfier, for the instrument of which they 

 have given a description, at the same time tliat they remark, 

 R 4 that 



