the glaistrade, an instrument used for squaring the large plates or pieces; and, among glaziers, for cutting their glaists.

These forts of diamonds are differently fitted up. That used for large pieces, as looking-glaists, &c. is set in an iron ferril, about two inches long, and a quarter of an inch in diameter; the cavity of the ferril being filled up with lead, to keep the diamond firm: there is also a handle of box or ebony fitted to the ferril, for holding it by.

heraldry, a term used for expressing the black colour in the achievements of perage.

Guillim does not approve of blazoning the coats of peers by precious stones instead of metals and colours; but the English practice allows it. Morgan says the diamond is an emblem of fortitude.