Prototype beam splitter for the Advanced Laser Interferometer Gravitational Wave Observatory (aLIGO) Astronomy 2008 (prototype)
Foucault Pendulum for demonstrating the Earth's rotation, with stand, divided arc, lapse clock, storage box Astronomy 1883
Brass quadrant by Peter and John Dollond of 18-inch radius with optical sights on a tripod Astronomy 1780-1820