William Cary of The Strand, London.
Traded at 272 Strand (1789-90), 182 Strand (1794-1822) & 181 Strand. Sold globes and other philosophical & mathematical instruments. In partnership with John Cary (1791-1816), but also traded independently for some work until William's death in 1825. The Science Museum has many examples of Cary instruments in its collection, many being illustrated online
1825 Died, 16 November, 'Mr. W. Cary, mathematical instrument maker, of the Strand.'
1834 Advert: 'To MECHANICAL MILLWRIGHTS. WANTED, a Foreman and Manager an extensive Concern in the above line : a person who has worked his way up from the bench through the different branches of his business,and is in every way qualified for such a situation, will find it well worth his notice.—Letters, (post paid) with real names and references, may be addressed to A. B. at Messrs. Cary’s. Mathematical Instrument Makers, Strand, London, on or before the ninth day of January, will be immediately attended to.'
William Cary was responsible for marketing much of the malleable platinum produced by William Hyde Wollaston. Customers included Thomas Young. In 1788 W H Wollaston's father, Rev Francis Wollaston, wanted a transit circle made to his own design, and tried without success to have it made by Jesse Ramsden and then Edward Troughton. Three years later, William Cary was recommended to Wollaston, and he produced the instrument and installed it at Rev. Wollaston's home in Chislehurst. Cary had served an apprenticeship under Ramsden.
Sources of Information
-  Science Museum Group - Collections Online -People
-  Ramsden surveying instruments - Wikipedia
- Oxford Journal - Saturday 26 November 1825
- Gore's Liverpool General Advertiser, 2 January 1834
- 'William Cary and his Association with William Hyde Wollaston, by John A. Chaldecott, Platinum Metals Review, 1979, 23, 3