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Petards

Petards are made of the best alloy of metal & fine
rosette that one can, in order that they do not burst,
namely one part of metal & two of fine
rosette or old cauldron, which is even better. Some
are of fifteen or seventeen lb & ch are
loaded with two & a half lb of good great grain
powder, & they are for applying on windows & common doors.
Others are of the weight of 25 to 27 lb and are loaded with 4
lb of powder. Others weigh 45 lb & are
loaded with eight lb of powder. And thus they are formed
according to the effort they have to make. On the outside, they are of a
regular shape, but on the inside, they are made like a
crucible,  narrower on the inside of the breech & becoming wider
towards the mouth. And this is to give force to the breech, because of
the quantity of powder they hold, & so that they do not
burst. At the breech one gives them Those of 45 lb
have a thickness of eight lines at the breech & become
thinner on the inside towards the muzzle, which is of 4 lines.
They are xiii thumbs long & seven in diameter at
the muzzle & opening.

