In the bulk head behind, on each side, is cut a small hole, large enough to receive a trough of the same size of the others; from which, to each side of the ship, lies a leading trough, one end coming through a sally port cut through the ship’s side, and the other fixing into a communicating trough that lies along the bulk-head, from one side of the ship to the other; and being laid with quick match, at the time of firing either of the leading troughs, communicates the fire in an instant to the contrary side of the ship, and both sides burn together.
Fire barrels, for a fire-ship, are cylindric, on account of that shape answering better both for filling them with reeds, and for stowing them between the troughs: their inside diameters are about 21 inches, and their length 33. The bottom parts are first filled with double-dipt reeds set on end, and the remainder with fire-barrel composition, which is, corned powder 30lb. Swedish pitch 12, saltpetre 6, and tallow 3, well mixed and melted, and then poured over them.
There are 5 holes of 3-quarters of an inch diameter, and 3 inches deep, made with a drift of that size in the top of the composition while it is warm: one in the centre, and the other four at equal distances round the sides of the barrel. When the composition is cold and hard, the barrel is primed by well driving those holes full of fuze composition, to within an inch of the top; then fixing in each hole a strand of quick-match twice doubled, and in the centre hole two strands the whole length; all which must be well driven in with mealed powder: then lay the quick-match all within the barrel, and cover the top of it with a dipt curtain, fastened on with a hoop to slip over the head, and nailed on.
Bavins, for a fire-ship, are made of birch, heath, or other sort of brushwood, that is both tough and quickly fired: in length 2.5, or 3 feet; the bush-ends all laid one way, and the other ends tied with two bands each. They are dipped, and sprinkled with sulphur, the same as reeds, with this difference, that the bush ends, only, are dipped, and should be a little closed together by hand, as soon as done, to keep them more compact, in order to give a stronger fire, and to preserve the branches from breaking in shifting and handling them. Their composition is, rosin 120lb., coarse sulphur 90, pitch 60, tallow 6, and mealed powder 12, with some fine sulphur for salting.
Iron-chambers, for a fire-ship, are 10 inches long, and 3.5. in diameter; breeched against a piece of wood fixed across the holes. When loaded, they are almost filled full of corned powder, with a wooden tompion well driven into their muzzles. They are primed with a small piece of quick-match thrust through their vents into the powder, with a part of it hanging out; and when the ship is fired, they blow open the ports, which either fall downwards, or are carried away, and so give vent to the fire out of the sides of the ship.
Curtains, for a fire-ship, are made of barras, about 3-quarters of a yard wide, and 1 yard in length: when they are dipped, 2 men, with each a fork, must run the prongs through the corner of the curtain at the same end; then dip them into a large kettle of composition (which is the same as the composition for bavins) well melted; and when well dipped, and the curtain extended to its full breadth, whip it between 2 sticks of about 5.5 feet long, and 1-5 inches square, held close by 2 other men to take off the superfluous composition hanging to it; then immediately sprinkle saw-dust on both sides to prevent it from sticking, and the curtain is finished.
Reeds, for a fire-ship, are made up in small bundles of about 12 inches in circumference, cut even at both ends, and tied with two bands each: the longest sort are 4 feet, and the shortest 2.5; which are all the lengths that are used. One part of them are single dipped, only at one end; the rest are double-dipped, i. e. at both ends. In dipping, they must be put about 7 or 8 inches deep into a copper kettle of melted composition (the same as that for bavins;) and when they have drained a little over it, to carry off the superfluous composition, sprinkle them over a tanned hide with pulverised sulphur, at some distance from the copper.
Stores for a Fire-Ship of 150 tons.
| No. | |||||
|---|---|---|---|---|---|
| Fire-barrels | 8 | ||||
| Iron chambers | 12 | ||||
| Priming composition barrels | 3 | ¹⁄₂ | |||
| Quick-match barrels | 1 | ||||
| Curtains dipped | 30 | ||||
| Long reeds single dipped | 150 | ||||
| Short reeds | - | double dipped | 75 | ||
| single dipped | 75 | ||||
| Bavins single dipped | 209 | ||||
Quantity of Composition for preparing the stores of a Fire-Ship.