9/18/2023 0 Comments Wild Theodolite Serial Numbers![]() ![]() In 1922 with business in a depressed state Cooke and Troughton & Simms merged with head offices at York. įrom the outset in 1826 and earlier Troughton and Simms of London excelled in the high precision work of dividing circles and so provided many observatories with large transit instruments and supplied national surveys such as the Ordnance Survey, with large transit theodolites. Thomas Cooke built a reputation for high quality optics and, as well as smaller instruments, supplied large instruments to observatories around the world. Cooke made the optical elements himself for both these instruments. In 1851 Cooke built a 7.25 inch equatorial telescope. One early notable instrument was a 4.5 inch equatorial refractor which would have been exceptional at the time. Thomas Cooke set up a business in York in 1837 making astronomical telescopes. ![]()
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