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fuch Water-Bellows as litre defcribed, be kept at work, 
at leaft as long again. 
It is farthermore a known thing to Miners, of what 
prodigious Lofs and Inconvenience it is, when the 
Hearth or Mouth of an Iron Furnace is placed low, 
. in a wet and damp Place, which they oftentimes are 
forced to do, in regard to the Axle-tree of the Water- 
Wheel which works the Bellows 5 for which Reafon 
fuch Furnaces as hand in the like moift Places, give 
daily confiderably lefs Iron, than others which are better 
fituated. There is like wife not a fmall Difficulty to 
find a fit Situation for fuch Iron Furnaces where Iron 
Guns are caft, and require deep Pits under the Mouth: 
of the Furnace : But by means of this new Invention; 
of Bellows , one may be at Liberty to place the Mouth, 
of the Furnace as high, as one pleafes, feeing it is very 
eafy to.guidethe Blaft by means of Wooden orLeaden: 
Tubes, as far as necefiary, and in a proper Dire&ion. 
into the Furnace, which Advantage cannot fo eafily 
be obtain'd by thofe Bellows in common ufe. 
Further, this may be accounted as no fmall Ad- 
vantage which thefe Bellows afford* in being of fo very; 
eafy a Stru&ure, that any Carpenter at firft Sight is able 
not only to conftru£fc the whole Engine, but eafily 
repair every Part of the fame, requiring at the fame 
time the leaft Repairs of any that can be ufed ; and if 
the Bellows fhould be caft Iron, they would laft for 
feveral Ages ; and when caft ftrong, they would not 
require any Weight to fink readily in the Water. 
One might caufe them to be cover'd with Lead, or 
make them of thin Copper with a thick Leaden Hoop 
at top, to make them fink. As for their Shape, it is 
not a&folutely neceffary they fhould be of the fame as 
