Compound levers belonging to the mechanical powers

Danish Instrument Inventory text:

Mechanical powers. Apparatus for demonstration of basic mechanical principles. Brass.Adjustable inclined plane, worm gear, compound balance, set of pulleys. 2 brass pillars Dia25-19 H300 on Dia160 base.Ref: AWH Phys Cab Hefte 1 Plate 21 fig 3,4. Compare George Adams catalogue (1794) plate 5 vol 3.Signed: J. Bidstrup fec Londini1791 (mentioned in letter)