(84) 
fitted exadly for it; the fliape whereof is to be fcen in the an- 
nexed 3. Figure. 
This double PFedge.hdng 12. or 1 5. Inches long, each piece 
of iCj and fo made, as being placed in their due pofition, they 
may make up a Cylinder^ cut DiagonaLvj'ik, The two flat 
fides, that arc contiguous, arc to be grcafed or oyled, that the 
one may flip the more eafily upon the other and one of them, 
which is to be uppermoft,'\having at the great end a hollow 
Creafelcnx. into it round about, for faftning a Cartridge^ full of 
Gunpowder^ to it with a thred, the round end of the Wedge being 
pared as much, as the thicknefs of the Paper or Pafl:board,thac 
holds the Powder, needs to make the outfide thereof even 
with the reft of the Wedge. This Wedge muft 'have an Hole e. 
drilled through the longeft fide of it, to be filled with priming 
Powder , for firing of the Powder in the Cartridge ; which needs 
have no more, than half a pound of Powder, though upon oc- 
cafion a greater quantity may beufed, asfliallbc found re- 
quifite» 
Then this Wedge.hemg firfl: thruft into the Hole with the Car- 
tridge, the round fide, where the Priming-hole is, being upper- 
jj^moft, the other Wedge'ls to be thruft in, home to the due pofi- 
tion, care being taken, that they fit the Hole in the Rock as 
exactly as may be. Then the end of the lower Wedgeihting 
about an Inch longer, than that of the upper outwardly, and 
flatned, priming Powder is to be laid upon it, and a piece of 
hurning Match or 'Thread d\ipz in Brimjlone or other fuch pre- 
pared combuftible Matter, faftned to it, that may burn folong, 
before it fire the Powder, as he, that orders it, may have time 
enough to retire quire out of the Pit or Adity having firft pla* 
ced a piece of Wood or Iron fo, as one end thereof, being fet 
againft the end of the lower Wedge, and the other againft the 
fidc-wall, fo as if cannot flip. Which being done, and the Man 
retired, when the Powder comes to take fire, it will firft drive 
out the uppermoft Wedge, as far as it will go ; but the flaunt- 
ing figure of it being fo made, as the farther it goes backward, 
the thicker it grows, till at the laft it can go no farther,then the 
fire 
