Thomas Sheraton style case and mathematical instrument set

Thomas Sheraton style case and small steel case e-key, for mathematical drawing instrument set, including a tri-square, parallel rule, scale and rectangular-protractor, sector, gunner’s callipers, semi-elliptical trammel, compass with screw for removable attachments, 6-inch dividers, 5-inch dividers, 4½-inch dividers, 4-inch dividers, small bow compass, 6 pen attachments for compasses, 2 pencil attachments for compasses each with an inserted pencil, brass point attachment for compasses, steel extension point for compasses, scalpel with integral file and compass adjustment tool and small steel ‘French’curve drawing instrument, by George Adams, London, England, 1750-1790

Set of mathematical drawing instruments by G.Adams, in Sheraton case, oak and mahogany, mid 18th century. The case contains a sector, parallel ruler, pair of callipers, rectangular protractor, curve drawing instrument and compasses and dividers.