Prototype beam splitter for the Advanced Laser Interferometer Gravitational Wave Observatory (aLIGO) Astronomy 2008 (prototype)
Movement for regulator clock with dead beat escapement, inverted grid iron pendulum with steel knife edge pivot on an agate plate and bubble level. Originally made by John Shelton, Shoe Lane, London, 1768-9, with later modifications. Clock movement for Shelton regulator clock Time Measurement 1768-1769
Filar micrometer, part of refracting telescope by John Smeaton on equatorial mounting with stand [RAS No.7] . Presented to Royal Astronomical Society in 1845 by Mrs Sommerville to whom it was left by Mrs Dixon, Smeaton's daughter. Filar micrometer, from John Smeaton's refracting telescope Astronomy 1770
Two-day chronometer by John Arnold and Son, no.43/133. With inscription "Thos Prest August 10th 1792", scratched on great wheel, Prest was apprenticed to John Arnold and foreman to his son at Chigwell Chronometer Time Measurement
Parts for Technicon Auto Analyser colorimeters Parts for Technicon Auto Analyser colorimeters Biochemistry
Ramsden's astronomical equatorial instrument, with 2-1/4 inch aperture and 18-inch focal length Astronomy 1770-1780
