7. (Steam Engine) The width of port opening which is uncovered by the
valve, for the admission or release of steam, at the instant when the
piston is at end of its stroke.
When used alone it means outside lead, or lead for the admission of
steam. Inside lead refers to the release or exhaust.
8. (Civil Engineering) the distance of haul, as from a cutting to an
embankment.
9. (Horology) The action of a tooth, as a tooth of a wheel, in
impelling another tooth or a pallet. Saunier.
Lead angle (Steam Engine), the angle which the crank maker with the
line of centers, in approaching it, at the instant when the valve opens
to admit steam. -- Lead screw (Mach.), the main longitudinal screw of a
lathe, which gives the feed motion to the carriage.
Lead"ed (?), a. 1. Fitted with lead; set in lead; as, leaded windows.