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Brass plane table protractor, British, 1821-1826

1821-1826
[Letter] 1836 Dec 3 [to] Messrs. Maudslay & Field, Lambeth/W. Simms, [asking for casts in soft iron to be made from patterns sent to the firm. The letter contains on the reverse a sketch and calculations]

Letter 1836 Dec 3 [to] Messrs. Maudslay & Field

1836
Circular instrument dividing engine made by William Simms, London, England in 1842 has been modified over time (wooden stand made at the Science Museum, 1954). The cast gunmetal, 46-inch dividing plate, with 4320 divisions on a inlaid silver ring is signed and dated, ‘Troughton & Simms, London, 1842’. The engine is similar to that made by Edward Troughton in 1793.

Circular instrument dividing engine.

1842
Universal instrument by William Simms, London; double circle 15in. diameter, base circle 16in. diameter.

Universal instrument by William Simms

1821-1826
Refracting telescope of 3 1/4-inch aperture and 45-inch focal length by William Simms, London with later finder, three eyepieces and eyepiece collar in fitted case, missing one eyepiece and equatorial mounting (RAS No.30, Sheepshanks No.4). Presented to the Royal Astronomical Society in 1857 by Miss Ann Sheepshanks sister of the Rev. Sheepshanks. Later given in 1957 to the British Astronomical Association.

Refracting telescope of 3 1/4-inch aperture and 45-inch focal length, and components

1821-1826