[CROSS- 4.] A beam placed across some part of a structure or mechanism; a transverse beam.
1594. T. B., La Primaud. Fr. Acad., II. 96. They want neither the bellowes, nor the crosse-beame, nor the cordes nor the organ pipes.
1611. Cotgr., Traversin, A crosse-beame, or peece of timber, in a ship, &c.
1706. Phillips (ed. Kersey), Cross-piece or Cross-beam, a Beam laid a-cross another: In a Ship, it is a great piece of Timber that goes a-cross two other pieces calld Bitts, and to which the Cable is fastend when the Ship rides at Anchor.
1825. Wood, Railroads, 146. The piston rods are attached to the cross-beams [in Stephensons Killingworth locomotive].
1844. Dickens, Mart. Chuz., xxxi. The old oak roof supported by cross-beams.