Troughton & Simms was a British instrument-making firm, formed when Edward Troughton

Edward Troughton

Edward Troughton FRS was a British instrument maker who was notable for making telescopes and other astronomical instruments.Troughton was born at Corney, Cumberland...

 in his old age took on William Simms as a partner in 1826.

It became a limited company in 1915 and in 1922 it merged with T. Cooke & Sons

T. Cooke & Sons

T. Cooke & Sons was a British instrument-making firm, founded by Thomas Cooke.The firm built the clock face on the Darlington clock tower.In 1922 it merged with Troughton & Simms to form Cooke, Troughton & Simms.-References:* *...

 to form Cooke, Troughton & Simms

Cooke, Troughton & Simms

Cooke, Troughton & Simms was a British instrument-making firm formed in 1922 by the merger of T. Cooke & Sons and Troughton & Simms.In 1938 its telescope-making business was acquired by Sir Howard Grubb, Parsons and Co. Ltd.-References:* * *...

.

The firm produced hundreds of astronomical instruments such as mural circles, transit circles, sextant

Sextant

A sextant is an instrument used to measure the angle between any two visible objects. Its primary use is to determine the angle between a celestial object and the horizon which is known as the altitude. Making this measurement is known as sighting the object, shooting the object, or taking a sight...

s, and other astronomical instruments for observatories around the world.

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.