TROCHOID

, in the Higher Geometry, a curve described by a point in any part of the radius of a wheel, during its rotatory and progressive motions. This is the same curve as what is more usually called the Cycloid, where the construction and properties of it are shewn.

TRONE Weight, was the same with what we now call Troy Weight.

Trone Pound, in Scotland, contains 20 Scotch ounces. Or because it is usual to allow one to the score, the Trone-pound is commonly 21 ounces.

Trone-Stone, in Scotland, according to Sir John Skene, contains 19 1/2 pounds.