Two models of Ditisheim's monometallic compensation balances for use with Elinvar hairsprings; (a) with raidal poising screws; (b) with sunk poising screws to avoid barometric disturbances Two models of Ditisheim's monometallic compensation balances for use with Elinvar hairsprings 1920-1925
Case of objects showing improvements made by Loseby in compensation balances and pendulums including 4 compensation balances, 12 small curved tubes, 14 small straight tubes, apparatus for illustrating Loseby's Pendulum, as for regulating motion of telescope objects showing improvements in compensation balances and pendulums circa 1843