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Soc1ete Genevo1se 4 1
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accurate adjustable angle gauges autocollimator beam BIPM Britain British calibration centre checking circular dividing comparator components Coventry Gauge Crown Copyright cylinder developed dial gauges diameter dimensional dividing head Eden's Edward Troughton electronic end bar end gauges engineering metrology errors factory flat fringes gauge blocks gear Henry Maudslay illustrated in Fig Imperial Standard Yard inch industry interferometer International Prototype Metre jig borer Johansson Joseph Whitworth lapping laser later lathe leadscrew lens lenses limit gauges line standard London magnification manufacture Maudslay measuring machine mechanical ment method metre metric metric system metrologists Metrology Department metrology instruments micrometer microscope millionth Moore and Wright mounted National Physical Laboratory Newall operation patent pitch Pitter plate precision principle production projector Richard Glazebrook Rolt scale Science Museum screw threads Sigma Societe Genevoise Solex standard of length surface Taylor and Hobson wavelength wavelength standard Weights and Measures workshop Zeiss instruments