Second-order lever inspired by a model proposed by Willem Jacob 's Gravesande in Physices elementa mathematica, experimentis confirmata (3rd ed., Leiden, 1742).
A turned column fixed to a profiled base carries the beam with a counterweight and two notches for shifting the fulcrum's position. A second column carries a pulley on which runs a cord connected to a weight serving as the effort. Two lead pans hanging from the lever act as the load. Fifteen nails dividing the beam into equal segments serve to vary the application of the load. Provenance: Lorraine collections.