Cooke, Troughton & Simms

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Cooke, Troughton & Simms Theodolite

Cooke, Troughton & Simms was a British instrument-making firm formed in York in 1922 by the merger of T. Cooke & Sons and 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.[1][2][3] During the Second World War 3,300 people were employed by the company.[4] In 1963 it became a part of the new Vickers Instruments Ltd and they ceased trading in 1988.[5]


The company produced a range of precision microscopes[5] and survey equipment including theodolites[6] and it manufactured one of the first usable interference microscopes.[7] 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[5]