( 480 
Wateno confiderable heights, and is applicable to enin- 
giiife Fires, &c. Another Ufe is by the Air thus force- 
ably driven out, to give very ftrong and lafting Blafls 
for Iron Forges, 
IL The next Letter treats of the feveral ways of 
fparing Fewel, in all great, as well as fmall Works, 
where the quantity of the Fewel much encreafes the 
Charges ; and this chiefly by a contrivance to burn the 
Smoak, by caufmg a draught of Air to come, or be 
forced down the Tunnel of the Chimney to the Fire- 
place ; which is done by applying the above defcribed 
Engine to the top of the Tunnel, which muft be clofed 
all but the place where the Engine is applied, and a con- 
tinual Stream of Air forced down upon the Fewel by 
the fwift Motion of the Engine. This he applies to 
Glaft- Works, Iron Works, Brewing, ^&c. and (ays V of 
the Wood or other Fewel 'may be faved. 
III. The third Letter treats of feveral Inventions to 
draw the Water out of Mines, by means of fome Ri- 
ver nor far diftant from them, and this is performed by 
the PrefTure of the Air to Cylindrical Veflels, being al- 
ternately evacuated, whofe Plugs alternately defcend- 
ing again, turn a Wheel, which raifes two Buckets that 
difcharge the Water ; this cannot Co well be explained 
without the Figures, therefore I refer to the Book it 
lelf for a fuller Information of this Machine, 
IV. The fourth Letter (hews a Method of draining 
Mines, where you have not the conveniency of a 
near River to play the aforefaid Engine where hav- 
ing touch'd upon the Inconveni^ncy of making a ra- 
cmm in the Cylinder for this purpofe with Gunpowder, 
he 
