Cooke, Troughton & Simms
in 1924 the company became a wholly owned subsidiary of Vickers. A new factory was built in 1938 in Haxby Road, York and the firm's telescope-making business was acquired by Sir Howard Grubb, Parsons and Co. Ltd. During the Second World War 3,300 people were employed by the company. In 1963 it became a part of the new Vickers Instruments Ltd and they ceased trading in 1988.
The company produced a range of precision microscopes and survey equipment including theodolites and it manufactured one of the first usable interference microscopes. A 1950 catalogue listed the following range of microscopes:
- M1005/M1025 - student microscopes
- M1000 - 'general purpose' microscope
- M2000 - microscope for 'routine and research investigations'
- M3000 - The M2000 with vertical adjustment to the stage
- M4000 - 'universal stand' for visual and photographic examination
- M6000 - stereo microscope
- M7000 - polarizing microscope
- Formation of the company by merger: Obs 45 (1922) 403
- Acquisition of telescope-making business: JRASC 32 (1938) 363
- Clarification that only telescope-making business was acquired: JRASC 32 (1938) 399
- Borthwick Institute for Archives, University of York Retrieved 23 November 2013
- Cooke, Troughton & Sims at microscopy-uk. Retrieved 23 November 2013
- Cooke, Troughton & Sims at landsurveying. Retrieved 23 November 2013
- Dyson J. (1950). "An Interferometer Microscope.". Proceedings of the Royal Society A. 204 (1077): 170–187. doi:10.1098/rspa.1950.0167.
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