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I. A Defcription of a new Invention o/Bellows, 
called Water-Bellows, by Martin Triewald, 
F. R. S. Captain of Mechanics , and Mili- 
tary Architect to his Swedifh Majejly 3 
communicated to the Royal Society by Sir 
Hans Sloan z y Bart. Pref R. S. &c. See 
, the Fig . in T ab . prefixed. 
S INCE fcarce any thing, efpecially what relates 
to Mechanical Contrivances, may be faid to have 
attained fuch a Perfedion as not to want any 
Improvement, it may not be amifs to undertake the 
Improvement of thofe Inventions that Time out of 
Mind have been pradifed, as well as to invent En- 
gines to do thofe Services that have been effeded by 
mere Labour. Of this the laft Age has produced not 
a fmall Number; yet he that firft undertook to con- 
vert Leathern Bellows into Wooden, which are made 
ufe of in this Country at all our Iron Forges and Fur- 
naces, &c. has procured as great a Benefit to this King- 
dom, as ever any Inventor of Eafe and Conveniency in 
the Necefiaries of Mankind. 
I have now the Honour to propofe fuch Bellows , 
which as to their EfFed will not be inferior to the laft- 
mentioned, but far more advantageous, not only for Iron 
Furnaces, but likewife for many other Smelting- works 
requiring large Bellows. 
It will doubtlefs feem in the Beginning a little 
ftrange, that Water fhould be able to blow the Fire ; 
bftt he, that has read the Thilofophkal Tranfa£lions 9 
G g and 
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