C 55 3 
I fixt a pipe of an inch and a half diameter to a 
pair of double bellows three feet diameter ; which 
pipe reached about one foot under the furface of the 
water in the boiler, to the end of which are fixed 
horizontally two branches, each about eight feet 
long, tapering from one inch diameter to about ~ 
of an inch. Thefe branches are bent in a circular 
manner, as in the plan, to anfwer the form of the 
concave, and are perforated with fmall holes about 
four inches diflant at the thickefl part, and decreaf- 
ing gradually in diftance, to within f of an inch, 
towards the fmall end. The reafon of thefe branches 
being made taper, and the diftance between the holes 
decreafing to the fmall end, was in order to give the 
greater power to the air forced by the bellows to dif- 
charge the water lodged in fuch a length of pipe j 
and I obferved by this method, that the water was 
gradually forced thro’ the holes to the end of each 
branch, and feemed to throw an equal quantity of 
air thro’ the water. 
The length of the pipe, to which the branches are 
fixed horizontally, is about 1 8 feet to the nolle of the 
bellows : notwithflanding which length, the fleam, 
that pahed thro’ the pipe into the bellows, was fo hot 
before the water boiled, as to force thro’ the leather ; 
but this I eafily remedied, by fixing a brafis cock of 
one inch and a half diameter to the pipe, which hin- 
dered the fleam from afcend'ing, until the engine 
was ready to work ; and being opened, the air con- 
tinually keeps it cold unT the engine has done 
working , rhen the cock mult be fhut again. 
The bellows is worked by means of a fmall lever,, 
and puilies applied to the great iever of the fire- 
engine* 
