Model of Henry Cavendish's Torsion Balance Gravitational Apparatus, 1798 1798 (original); 1977 (model)
Large component of Charles Vernon Boys' Torsion Balance gravitational apparatus by The Cambridge Scientific Instrument Co., England, 1889. Components include: three tubes, one hood, split flanges, one mercury thermometer by J. Hicks of London, copper wire, length of bronze wire, two steel rods with brass spheres. Charles Vernon Boys' Gravitational Apparatus by The Cambridge Scientific Instrument Co., 1889 1889