Troughton & Simms
Previously, Troughton had been a sole proprietor, and before that he was in partnership with his brother John. John died and Edward took on Simms in 1826. Edward Troughton died in 1835.
In 1876 they supplied the Imperial Standards Of Length gauges mounted at Trafalgar Square in London UK.
- King, Henry C., (1955/2003). The History of the Telescope. Cambridge, Massachusetts: Sky Publishing Corporation. Retrieved from Google Books in 2009: The History of the Telescope, by Henry C. King, page 234-6