SHELL n.
, the exterior of a steam boiler, forming a case to contain the water and steam, often inclosing also flues and the furnace; the barrel of a cylindrical, or locomotive, boiler. -- Shell road, a road of which the surface or bed is made of shells, as oyster shells. -- Shell sand, minute fragments of shells constituting…
SHUT v.
de. (b) To prevent the passage of, as steam through a pipe, or water through a flume, by closing a cock, valve, or gate. -- To shut out, to preclude from entering; to deny admission to; to exclude; as, to shut out rain by a tight roof. -- To shut together, to unite; to close, especially to close by welding. -- To sh…