be put mFrdtice to all Intents and PurpofeS;, as if this Jmfe^ 
diment were abiblutely Removed, 
An Account df an Experiment pewn before the Royal 
Society, of Shooting by the KarefaSiion of the Air : 
BjDnD.Papin, R.S S. 
WHereas ordinary Wind-Guns do their ffFeil by the 
Co/npreflion of the Air. Ottho Ghericke hath found a 
new Sort that fhoots by Rarefadion ; and lie hath Publifiit 
that device at large in his Book about Vneummck Experiments^ 
but he doth not exprcfs how ftrong was the Effeei. I have 
therefore had the Curiofity to try it my felf by another Con« 
trivance, which I take to be better than his : Firft, becaufe I 
can make a Rarefaction much more perfefh than he could 
do. Secondly, becaufe his Device could not be ufed but for 
Guns ofa finall bore; but my way maybe apply M to the 
biggeft bore that can be made by Workmen : So that one 
might by this means throw up vaft Weights to a great 
diftance. 
A A is a Pipe very equal from one end to the other. 
B B a finall Pipe foderM to a Hole near the end of the 
Pipe A A, and apply 'd to the Plate of the Pneumatick Er.- 
gine. 
C C C C fbme kind of Stool to bear up the hinder part of 
theTipe A A, 
D. a peice of Lead fitted to the bore of the pipe A A, 
The pipe A A is to be fliut at both ends hy Valves out^ 
wardly apply'd, and fothefaid pipe A A, though never 
big, may be exhaufted of Air by means of the Pmumaiick 
Engine: Which done, the /^^/z^r towards Dmuft be fudder - 
ly openM, that the wiiole prellure of the Atmofphere <x:±' 
ing upon the Lead D may drive it along the pipe A A with 
C 3 fuch 
