Large, heavy sector. Very finely engraved. Usual English-type double sector scales and other double scales. Embedded circular hinge. Strut or friction leaf (.1 x 24.6 x 4.1 cm). Signature of maker on (b), split between upper and lower leg, left.
Материал
"Improved by G. ADAMS, Instrument Maker/. to HIS •MAJESTY, Fleet-Street LONDON"
