Artificial fire-works : $b improved to the modern practice, from the minutest to the highest branchesJones, Robert
History
Artificial fire-works : $b improved to the modern practice, from the minutest to the highest branches
Jones, Robert
Fireworks -- Early works to 1800
Having taught the method of ramming cases in moulds; we shall here say
something concerning those filled without moulds, which method, for
strong pasted cases, will do extremely well, and save the expence of
making so many moulds. The reader must here observe, when he fills any
sort of cases, to place the mould on a perpendicular block of wood,
and not on any place that is hollow, for we have found by experience,
that when cases were rammed on driving benches, which were formerly
used, the works frequently miscarried, on account of the hollow
resistance of the benches, which often jarred and loosened the charge
in the cases; but this accident has never happened since the driving
blocks[6] have been used.
When cases are to be filled without moulds, proceed thus; have some
nipples made of brass or iron, of several sorts and sizes, in
proportion to the cases, and to screw or six in the top of the driving
block; when you have fixed in a nipple, make, at about one inch and a
half from it, a square hole in the block, six inches deep and one inch
diameter; then have a piece of wood, six inches longer than the case
intended to be filled and two inches square; on one side of it cut a
groove almost the length of the case, whose breadth and depth must be
sufficient to cover near half the case; then cut the other end to fit
the hole in the block, but take care to cut it so that the groove may
be of a proper distance from the nipple: this half mould being made
and fixed tight in the block, cut, in another piece of wood nearly of
the same length as the case, a groove of the same dimensions as that
in the fixed piece; then put the case on the nipple, and with a cord
tie it and the two half moulds together, and your case will be ready
for filling.
The dimensions of the above described half moulds, are proportionable
for cases of eight ounces; but notice must be taken, that they differ
in size in proportion to the cases.
Note, the clay, mentioned in this article, must be prepared after this
manner; get some clay, in which there is no stones nor sand, and bake
it in an oven till quite dry; then take it out and beat it to a
powder, and afterwards sift it through a common hair sieve, and it
will be fit for use.
Of the Proportion of Mallets.
The best wood for mallets is dry beech, though some have preferred
other sorts of woods and have likewise pretended to determine their
exact weight, which is not of much signification; however, for the
better instruction of those who have not made a great progress in this
art, I shall here give a good proportion for mallets; but at the same
time would have every practitioner know, that if he makes use of a
common mallet, of a moderate size, in proportion to the rocket,
according to his judgment, and if that rocket succeeds, he may depend
on the rest, by using the same mallet; yet it will be necessary that
cases of different sorts be drove with mallets of different sizes.
Public-domain text, read in full here on John Shaqi.
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