Compound lever demonstration model for explaining the function of different combinations of levers, unknown maker, before 1753. Once belonged to Stephen Demainbray. Demainbray's compound lever 1701-1752
Compound Lever, consisting of 3 levers, 2 pivoted on single pillars, & 1 pivoted on cross-arm of 2 pillars, on wooden base (original brass balance weight missing). Compound lever, 1762. 1762