to the foot.
2. A lozenge or rhomb. The name is conferred upon nuts and bolt-heads of that form.
Also upon gravers which are rhombal, and not square in crosssection.
3. A valuable gem, the hardest of all, and of various colors.
It has many uses in the mechanic arts, derived from its extreme hardness; some uses in optics, owing to its high refractive and small dispersive power.
Sp. gr. 3.521.
Among the celebrated diamonds may be noted the following:— Great Mogul. Found in 1550, in Golconda, and seen by Tavernier.
Weighed 793 carats; cut to 279 carats (carat, 4 grains).
Russian. Taken from a Brahminical idol by a French soldier; sold to the Empress Catherine for £ 90,000 and an annuity of £ 4,000. Weighs 194 carats.
Pitt. Brought from India by Mr. Pitt, the grandfather of the first Earl of Chatham; sold to the Regent Duke of Orleans, in 1717, for £ 135,000. Weighed when rough, 400 carats; cut to 136 1/2 carats.
Napoleon placed it in the hilt of his sword.