\M'-Naught"\ (mak*n[add]t"), v. t. (Steam Engines)
To increase the power of (a single-cylinder beam engine) by
adding a small high-pressure cylinder with a piston acting on
the beam between the center and the flywheel end, using
high-pressure steam and working as a compound engine, -- a
plan introduced by M'Naught, a Scottish engineer, in 1845.