Demainbray's turquoise disc
1745-1755
Demainbray's yellow disc
1745-1755
Green glass disc, 1725-1750.
1725-1750
Pair of coloured glass discs, 1750.
1745-1755
Wood screw from green glass disc, 1725-1750.
1725-1750
Ten blackwood and ivory discs
1843-1884
Disc, metal, obverse covered with concentric grooved circles
Disc, metal, obverse covered with concentric grooved circles
Pair of Marble Adhesion Discs, with Band and Ring Handle
Eight ivory discs inlaid
1843-1884
Four ivory stage discs
Two Pairs of Discs for Bottoming Machine
Green glass disc, 1725-1750.
1725-1750