steam-packing

Definitions

noun In machinery: Any material used in a joint to make it steam-tight.
noun The material used in a stuffing-box to keep steam from leaking through an opening in which a rod slides in and out.
noun A form of packing for steam-pistons in which the packing-rings in the piston are forced out against the bore of the cylinder by pressure of steam admitted into the grooves behind or inside of the rings. The rings may be made in sections to yield easily to this radial pressure.

Sorry, no etymologies found.

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In a little while the door opened about a foot, and there stood Mr. Hunter -- or Mirsky, as you like -- the man who, in the character of a traveler in steam-packing, came here twice to-day.

Martin Hewitt, Investigator Arthur Morrison 1904
I have a very important -- very excellent steam-packing to show him that is very cheap and the best of the market. "

Martin Hewitt, Investigator Arthur Morrison 1904