A bar that forms a guide for the crosshead of an engine or other moving piece.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
Park, who was cook this week, had gone to the village for supplies, and so the captain and Tod were alone in the house, the others, with the exception of Morgan, who was at his home in the village with a sprained ankle, being at work some distance away on a crosshead over which the life-line was always fired in gun practice.
"The Tides of Barnegat"
F. Hopkinson Smith
The piston rod and the crosshead obviously passed through its gun deck in a large hatch.
"Fulton's "Steam Battery": Blockship and Catamaran"
Howard I. Chapelle