Crosshead

( Mech.) In the steam-engine, a cro bar fixed centrally on the top of a piston-rod, and connected to the beam; its motion is confined to a direct line by guides at each end; or, in the side lever and beam engines, by an apparatus called a parallel motion. - Cro -Head Guides. The parallel bars between which the cro -head moves in a right line with the cylinder and driving-wheel axle; they are also called motion bars. -Cro -Head Blocks. The parts which slide between the parallel guides. The ends of the cro -head are fitted into these blocks. The cro -head, cro -head block, and cro -head guides constitute what is called the motion of the engine. Cro Hill, in Maine , a P. O. of Kennebec co. Cro Hill, in S. Caround , a township of Laurens dis- trict. Cro 'ing, in Indiana , a former P. O. of co. cro -bow. IMG:content-0425.png:[blocks in formation]