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, and also by the radiating struts which are in pairs, notched out so as to clip the rib between them. Emy's arched-beam roof. The principals, wall-posts, and arched rib form two triangles, firmly braced together, and exert no thurst on the walls; the weight of the roof, being thrown on the walls at the feet of the ribs, and not at the pole plate, permits the upper portion of the walls to be comparatively light. The Colonel erected a roof of this description in 1825 at Marac, near Bayonne. The principle has been extensively adopted in wooden bridges in the United States and in Europe. See wooden bridge. The illustration opposite represents the roof of the Union Passenger Depot of the New York and Harlem Railway, projected by Commodore Vanderbilt, and constructed from the designs of J. C. Buckhout, C. E. The roof is 652 feet long and 199 feet 2 inches between walls. It is supported upon 32 semicircular trusses, which are spaced 20 feet 4 inches between centers, exten
pboard. 4. (Ship.) That part on each side between decks of a man-of-war which lies forward of the butts. 5. (Bridging.) The portion between two piers. 6. (Mining.) The space between two frames in a gallery. 7. (Hydraulic Engineering.) a. The head of a lock. b. A compartment containing water for a wheel, as a fore-bay. Bay-bolt. One with a barbed shank. Bay′o-net. A piercing weapon, fixable on the muzzle-end of a fire-arm. They were originally made at Bayonne, in France, in the latter half of the seventeenth century, and used by that nation in the Netherlands in 1647. The weapon was introduced into the English army in 1672, and used at Killiecrankie, in Perthshire, where the forces of William of Orange, commanded by Mackay, were defeated by those of James II., under the command of Graham, of Claverhouse, 1689; and also at the battle of Marsaglia, 1693, with great success against the enemy, unprepared for the encounter with so formidable a novelty.