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Knight's Mechanical Encyclopedia (ed. Knight) 3 1 Browse Search
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ort. Gorge.Stockade. Half-moon.Sunken battery. Half-sunken battery.Superior slope. Herrison.Swallow-tail. Herse.Tenailles. Hersillon.Tenaillon. Horn-work.Terre-plein. Hurdle.Tete de pont. Hurter.Tower. Indented line.Trace. Indented parapet.Traverse. Interior slope.Traversing-platform. Trench.Turret. Trench-cart.Van-fosse. Trench cavalier.Zigzag. Trous de loup. For′tress. A large permanent fortification, such as, on our continent, Fortress Monroe, Quebec, St. Juan de Ulloa, Moro Castle. They are too numerous in Europe to be thus summarily cited. For′ty-eightmo. (Printing.) A book made up of sheets printed 48 pages on a side. 48mo. For′ward-fire Cartridge. One in which the fulminate is at or in the base of the ball, forward of the powder. It is exploded by a stem d, as in the figure, or else by a needle which penetrates the whole extent of the powder, and strikes the fulminate in the base of the bullet. See needle-gun. Forward-fire cartr
e sometimes made use of. Mirrors of stone were found among the Peruvians when first visited by the Spaniards. Some of these were made of a black, somewhat transparent, vitrified lava, called by the Spaniards gallinazo, similar to the obsidian stone employed by the Romans for the like purpose. These mirrors were plane, concave, and convex. The Peruvians also made them of a species of pyrites called the Inca's stone, from its being much used in ornaments by the Incas or princes of Peru. Ulloa saw one which was 2 1/2 feet in diameter; but they did not usually exceed 2 to 3 inches. This people had also, it would appear from De la Vega, mirrors of silver, copper, and brass. The date of the invention of glass mirrors is not certainly known. From the account of Pliny, it would seem that they had been formerly made at the celebrated glass-houses of Sidon. These were probably of a dark-colored glass, having a resemblance to the obsidian stone. Transparent glass having a backing of