NEW STOVE 67 
therefore never be fpit upon, or greafed, nor fhould any 
duft be fuffered to lie upon them. But as the greateft care 
will not always prevent thefe things, it is well once a 
week to wath the ftove with foap lees and a brufh, rinfing 
it with clean water. 
The Advantages of this Stove. 
1. The chimney does not grow foul, nor ever need 
fweeping; for as no {moke enters it, no foot can form in it. 
2. The air heated over common fires inftantly quits the 
room and goes up the chimney with the fmoke; but 
in the ftove, it is obliged to defcend in flame and pafs 
through the long winding horizontal paflages, communi- 
cating its heat to a body of iron plate, which having thus 
time to receive the heat, communicates the fame to the air 
of the room, and thereby warms it to a greater degree. 
3. The whole of the fuel is confume d by beingturned 
into flame, and you have the benefit of its heat, whereas 
in common chimneys a great part goes away in fmoke 
-which you fee as it rifes, but it affords you no rays of 
warmth. One may obtain fome notion of the quantity of 
fuel thus wafted in fmoke, by reflecting on the quantity 
of foot that a few weeks firing will lodge againft the fides 
of the chimney, and yet this is formed only of thofe par- 
ticles of the column of {moke that happen to touch the fides 
in its afcent. How much more mutt have paffed off in 
the air? And we know that this foot is ftill fuel; for it 
will burn and flame as fuch, and when hard caked toge- 
ther is indeed very like and almoft as folid as the coal it 
proceeds from. ‘Thedeftruction of your fuel goes on near- 
ly in the fa:ne quantity whether in fmoke or in flame: but 
there is no comparifon in the difference of heat given. 
Obferve when frefh coals are firft put on your fire, what a 
body of {moke arifes. This {moke is for a long time too 
cold to take flame. If you then plunge a burning candle 
into it, the candle inftead of inflaming the fmoke will in- 
L2 {tantly 
