from The Century Dictionary and Cyclopedia
- n. In steam-engines, a ring fitting in a groove round a piston to keep it steam-tight by confining the packing.
Sorry, no etymologies found.
They removed two of the piston junk-ring studs, screwed in two strong iron eye-bolts by way of handles, doubled the wire-rope, and set half a dozen men to smite with an extemporised battering-ram at the end of the piston-rod, where it peered through the piston, while the donkey-engine hauled upwards on the piston itself.
Walker dived below to the engine-room, where he had already disconnected the rods broken or bent by the fracture of a guard ring, which, in its turn, was injured by the blowing out of a junk-ring, a stout ring of forged steel secured to one of the pistons.