60 DESCRIPTION or a 
“¢ forcible, and beats down the flame to that part where 
“it finds the leaft refiftance. Carrying the machine firft 
“to the kitchen fire for preparation, is on this account, 
‘“« that in the beginning the fire and fmoke naturally afcend, 
“ till the air in the clofe barrel C is made thinner by the 
“warmth. When that veffel is heated, the air in it is 
“‘ rarefied, and then all the fmoke and fire defcends 
‘* under it. 
“The wood fhould be throughly dry, and cut into 
‘¢ pieces five or fix inches long, to fit it for being thrown 
‘“* into the funnel A.”? Thus far the German book. 
It appears to me by Mr. Leutmann’s explanation of 
the operation of this machine, that he did not underftand 
the principles of it, whence I conclude he was not the in- 
ventor of it; and by the defcription of it, wherein the 
opening at A is made fo large, and the pipe E, D, fo fhort, 
Iam perfuaded he never made nor faw the experiment, for 
the firft ought to be much {maller and the laft much higher, 
or ithardly will fucceed. The carrying it in the kitchen, 
too, every time the fire fhould happen to be out, muft be fo 
troublefome, that it is not likely ever to have been in prac- 
tice, and probably has never been fhown but as a philofo- 
phical experiment. The funnel for conveying the va- 
pour out of the room, would befides have been uncertain 
in its operation, as a wind blowing againft its mouth would 
drive the vapour back. 
The ftove Iam about to defcribe, was alfo formed on 
the idea given by the French experiment, and completely 
carried into execution before I had any knowledge of the 
German invention; which I wonder fhould remain fo many 
years in a country where men are fo ingenious in the ma- 
nagement of fire, without receiving long fince the im- 
provements | have given it. 
DESCRIPTION 
