# 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.