t »3« 3 
as poffible ; all which may with good Reafon be ap- 
plied to thefe Water -Bellows . 
And though it cannot be denied, but that the Bel- 
lows which finks down into the Water-hole or Sump 
N, grows fo much lighter, as it lofes of its Weight 
in Water, by which means the Water-Bellows x. o be 
raifed grows fo much heavier, as the former lofes of 
its Weight by being let down into the Water 5 yet 
-this is compenfated, if we confider, that the Water 
which falls down along the flopeing Gutter, ac- 
quires a Power of a falling Body; which Power in- 
creafing in the fame Proportion as the Bellows to 
be raifed grows heavier, this Power fuits admi- 
rably well the Weight to be raifed j for th z Bellows 
that finks down into the Sump N, does not at once 
lofe its Weight in the Water, but gradually as it 
comes deeper into the fame j and_ after the fame man- 
ner the afcending Bellows does not grow at once hea- 
vier than the other, but gradually, growing heavieft 
juft when the lowermoft Edge gets even with the Sur- 
face of the Water; and that happens at the fame In- 
ftant of Time when the Power of the Water in the 
flopeing Gutter is at the higheft pitch, or has received 
its greateft Momentum . 
This fhews, I hope, very plain, that the Power 
required to work thefe Water-Bellows , is far lels, 
and confequently lefs Water will be confumed in 
working thefe Bellows than thofe commonly ufed; 
and again, that an Iron Furnace, which for want of 
Water to work the common Bellows , cannot be kept 
at work longer than fix Weeks, though it be pro- 
vided with all other Neceffaries, may, by means of 
fuch 
