84 x 55 Steel and brass
Fraudulent balance
84 x 55 Steel and brass
Musschenbroek, Peter Van, Introductio ad Philosophiam Naturalem, Leiden, 1762, Vol. I, § 403, Tab.IV, Fig 7.
's Gravesande, Willem Jacob, Physices Elementa, Leiden, 1742, Vol. I, § 96, Tab VI, Fig 5.