A military dictionary

by William Duane

MADRIERS, are long planks of broad wood, used for supporting the earth in mining, carrying on a sap, making coffers, caponiers, galleries, and various other purposes at a siege; also to cover the mouth of petards after they are loaded, and are fixed with the petards to the gates or other places designed to be forced open. When the planks are not strong enough, they are doubled with plates of iron.

MAGAZIN, Fr. magazine.

Petit-Magazin. Fr. This was a sort of intermediate building, called entrepot, where stores, provisions, &c. to answer daily consumptions were deposited.

Magazin d’approvisionnement, Fr. magazine of stores.

Magazin d’artillerie, Fr. gunpowder magazines.

MAGAZINE, a place in which stores are kept, or arms, ammunition, provisions, &c. Every fortified town ought to be furnished with a large magazine, which should contain stores of all kinds, sufficient to enable the garrison and inhabitants to hold out a long siege, and in which smiths, carpenters, wheel-wrights, bakers, &c. may be employed in making every thing belonging to the artillery, as carriages, waggons, &c.

Powder-Magazine, is that place where the powder is kept in very large quantities. Authors differ greatly both in regard to situation and construction; but all agree, that they ought to be arched, and bomb-proof. In fortifications they are frequently placed in the rampart; but of late they have been built in different parts of the town. The first powder magazines were made with gothic arches; but M. Vauban, finding them too weak, constructed them in a semicircular form, whose dimensions are, 60 feet long, within; 25 broad; the foundations are eight or nine feet thick, and eight feet high from the foundation to the spring of the arch; the floor is 2 feet from the ground, which keeps it from dampness.

An engineer of great experience some time since, had observed, that after the centres of semicircular arches are struck, they settle at the crown and rise up at the hances, even with a straight horizontal extrados, and still much more so in powder magazines, whose outside at top is formed like the roof of a house, by two inclined planes joining in an angle over the top of the arch, to give a proper descent to the rain; which effects are exactly what might be expected agreeable to the true theory of arches. Now, as this shrinking of the arches must be attended with very ill consequences, by breaking the texture of the cement, after it has been in some degree dried, and also by opening the joints of the voussoirs, at one end, so a remedy is provided for this inconvenience, with regard to bridges, by the arch of equilibration in Mr. Hutton’s book on bridges; but as the ill effect is much greater in powder magazines, the same ingenious gentleman proposed to find an arch of equilibration for them also, and to construct it when the span is 20 feet the pich or height 10, (which are the same dimensions as the semicircle) the inclined exterior walls at top forming an angle of 113 degrees, and the height of their angular point above the top of the arch, equal to seven feet: this very curious question was answered in 1775 by the Rev. Mr. Wildbore, to be found in Mr. Hutton’s Miscellanea Mathematica.

Artillery-Magazine, in a siege, the magazine is made about 25 or 30 yards behind the battery, towards the parallels, and at least 3 feet under ground, to hold the powder, loaded shells, port-fires, &c. Its sides and roof must be well secured with boards to prevent the earth from falling in: a door is made to it, and a double trench or passage is sunk from the magazine to the battery, one to go in and the other to come out at, to prevent confusion. Sometimes traverses are made in the passages to prevent ricochet shot from plunging into them.

Magazines. The present practice is not to make large powder magazines for batteries, but to disperse the barrels of powder, or cartridges here and there in small magazines, about 6 or 7 fathoms, in the rear of the battery; as it appears better to lose a small quantity from time to time, than to run the risk of the whole being destroyed, by a single shell falling into the magazine. These small magazines or entrenchments, will hold about one or two tons of powder; and are about eight or 9 feet square. They ought to be well covered from the fire of the place, and always in the rear of one of the merlons. When they cannot be sunk in the ground, they should be secured by sand bags or gabions. They should be made with attention, as should the communication from them to the battery. Two magazines of this kind will be required for a battery of six pieces.