[ 3*5 ] 
vafis rotatis pulvinaria loco manuum applicantur, 
eledlricitas decrefcit. 
XIX. A T)efcrlptlon of a Machine to blow 
Fire by the Fall of Water ; by James Stir- 
ling, F. R. S. 
See Tab. I. Fig. 6. 
» 
Read March 2 1 . 
1 744 - 5 - 
ABC IS) is a Pit dug in the Ground 
whole Surface is higher at T) than 
on the other Side at A. The Bottom B C is ftrongly 
ramm’d with Clay, upon which are laid thin fawen 
Deals. 
In this Pit is fixed a Tub GHK1 without a Bot- 
tom, having a Hole I at the lower Part of the Side, 
and all round the Tub is ramm’d with Clay, except 
at the Hole 1. 
In the middle of the upper End of the Tub is 
fixed a Pipe P(fRSi at the higher End of which 
are four Holes pointing downwards, whereof two are 
reprefented by S and R. 
SRTU is a Funnel fixed on the Top of the 
Pipe, with a Throat XZ narrower than the Bore of 
the Pipe. In the upper End of the Tub towards one 
Side is fixed a crooked Pipe at L M, tapering to the 
End at N. It is made of Wood fo far as O, but 
from O to N of Iron, the Fire being fuppofed at JV. 
E F is the Surface of a plain Stone, railed up in the 
middle of the Tub, dircdlly under the Pipe RCRS. 
The 
