steam hammer

steam hammer (plural steam hammers)

1. An industrial machine designed to produce a hammer action through steam power.
   • 1944 November and December, A Former Pupil, “Some Memories of Crewe Works—II”, in Railway Magazine, page 341:

     The steel works, with their Siemens furnaces, the rail-rolling mill with its enormous single-cylinder engine fitted with Corliss valve gear, and the forge in which were installed the great steam hammers and hydraulic presses—these were teeming with interest, and the best way to pick up information was to work with the millwrights.

• drop hammer