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Antique Troughton & Simms Circular Protractor, circa 1826


Offered for sale is an antique brass circular protractor, made be Troughton & Simms of London. This brass circular protractor is engraved with the maker's name. Measuring 6 inches in diameter is in fine original condition and is circa 1826.

Troughton & Simms was a British instrument-making firm, formed when Edward Troughton in his old age took on William Simms as a partner in 1926. The firm produced hundreds of instruments, including astronomical, surveying, drawing, mural circles, transit circles, sextants, and astronomical instruments for observation 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. Troughton & Simms's shop in Fleet Street became the hub of the finest scientific instrument making in London, in a period in which there was an expanding demand for precision instruments for astronomy, surveying and precision measurement. They made instruments for Greenwich Observatory, for imperial surveys and exploring expeditions. When fire destroyed the Houses of Parliament in 1834, the firm was commissioned to create new standard lengths, necessitating 10 years of testing of the remaining measurers. #071.085

Note the early features: The single numbering of degrees, instead of double numbering in reverse directions, and the decorative five-degree divisions, divided to half a degree. The instrument is a nice example by an important maker.

Definition: a PROTRACTOR (goniometer) is a generic name for instruments used to divide circles and measure plane angles. They can be circular, semicircular or rectangular. To increase its accuracy, the protractor was often inserted in a 'nonius', a device for enhancing the precision of the measurements made by a direct readout on a graduated scale.

Reference: McConnell, Anita (1992). Instrument Makers to the World: A History of Cooke, Troughton & Simms, York: William Sessions Limited.

Provenance: Sotheby's, March, 1996

Shipping: FREE to the United States. We also will ship worldwide.

Please look at the picture and read the description, which form a part of the condition description. What you see and what you read is what you are buying

International purchasers should contact sellers at: CAPTAINMADISON@ATT.NET for a shipping and insurance quote to your address and country. International purchasers should appreciate that the Customs Dept. of your country may assess duties, taxes and/or other charges on your purchase as it enters your country, which expenses are not part of the purchase price for this item and remains the sole expense of the purchaser.

This product would make a wonderful addition to any scientific instrument or sundial collection when displayed in a prominent place, being a grand collectible item that would adorn any serious collector's prized scientific instrument and sundial accumulations, while showing a discriminating dedication for fine sundials and other scientific instrument items as well as a devotion to acquiring fine collectibles.

Sellers exclusively use the USPS as its' shipper (insurance available).

Please email sellers to: CAPTAINMADISON@ATT.NET for purchasing, payment, shipping arrangements, requests for more photos, as well as any other inquiries.

Payments may be made by check (must clear), bank checks, postal or bank money orders, Western Union money transfers, pre-payment arrangements, good old U.S. Dollars (green currency), and/or other secure money transfers or payments.

Please regularly visit our other web sites for more sundials and scientific instruments and related products as we shall regularly be adding more products from time to time:

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  • Model: Antique Circular Protractor

This product was added to our catalog on Tuesday 11 February, 2014.

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