Jack: Difference between revisions

Latest revision as of 14:39, 3 June 2024

n.) A hood or other device placed over a chimney or vent pipe, to prevent a back draught.

Revision as of 02:02, 3 June 2024 view source 49.36.183.129 (talk) CSV import ← Older edit		Latest revision as of 14:39, 3 June 2024 view source 85.208.96.206 (talk) CSV import
(6 intermediate revisions by 6 users not shown)
Line 1:		Line 1:
	n.) A ~~portable machine variously constructed, for exerting great pressure,~~ or ~~lifting or moving~~ a ~~heavy body through a small distance. It consists of a lever, screw, rack and pinion, hydraulic press,~~ or ~~any simple combination of mechanical powers~~, ~~working in a compact pedestal or support and operated by a lever, crank, capstan bar, etc. The name is often given~~ to a ~~jackscrew, which is a kind of jack~~.		n.) A hood or other device placed over a chimney or vent pipe, to prevent a back draught.