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-- By main strength, by sheer strength; as,
to lift a heavy weight by main strength. -- Main
beam (Steam Engine), working beam. --
Main boom (Naut.), the boom which
extends the foot of the mainsail in a fore and aft vessel. --
Main brace. (a) (Mech.)
The brace which resists the chief strain. Cf. Counter
brace. (b) (Naut.) The brace
attached to the main yard. -- Main center
(Steam Engine), a shaft upon which a working beam or side
lever swings. -- Main chance. See under
Chance. -- Main couple (Arch.),
the principal truss in a roof. -- Main
deck (Naut.), the deck next below the spar deck;
the principal deck. -- Main keel
(Naut.), the principal or true keel of a vessel, as
distinguished from the false keel.

Syn. -- Principal; chief; leading; cardinal; capital.

Main, adv. [See Main,
a.


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