Permanent batteries, if good stone is not to be had, should be made of brick placed on the edge.

PLATFORMS. The common platforms for gun batteries require the following materials for each: 5 sleepers or joists, 6 inches square, 14 feet long.—1 hunter, 8 or 10 inches square, 8 feet long, 14 planks, 1 foot wide, 11 feet long, 2¹⁄₂ inches thick.—20 pickets.

The usual slope of platforms for guns is one inch to every yard.

The platforms for mortar batteries are made with 3 sleepers 8 inches square, and covered with about 11 timbers of the same thickness. They are laid perfectly horizontal, about 15 feet asunder, and 12 feet from the epaulement. This is the distance commonly practised for firing only at 15 degrees elevation; but if the platforms be placed at the undermentioned distances from the epaulement, the mortars may be fired at the angles corresponding.

At13feetdistance for firingat30degrees.
21feetat20
30feetat15
40feetat10

over an epaulement of 8 feet high. See [Battery].

PLATINE de lumiere, Fr. The same as Plaques de Plomb, as far as it regards cannon. With respect to musquets and other firearms, it means that part of the hammer which covers the pan.

PLATOON, in military affairs, was formerly a small body of men, in a battalion of foot, &c. that fired alternately. A battalion was then generally divided into 16 platoons, exclusive of the grenadiers, which formed 2 or 4 platoons more, as occasion required. At present a battalion is generally divided into wings, grand divisions, divisions, (platoons or companies) subdivisions, and sections; and the word platoon is generally used, to denote a number (from 10 to 20) of recruits assembled for the purpose of instruction, in which case it may be considered as synonimous with company; but a platoon may consist of any number under a battalion.

PLATRAS, Fr. Rubbish, such as ashes, pieces of broken brick, mortar, &c. It is used by refiners, for the purpose of distilling saltpetre into proper vessels.

PLATRER, Fr. to plaster, to patch, to daub over.