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Owen Biddle

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Another mathematical practitioner associated with David Rittenhouse in his observations of the transit of Venus was Owen Biddle (1737–1799) of the North Ward, Philadelphia.

In early life Biddle was an apothecary and a clock- and watch-maker. In his shop "next door to Roberts warehouse" he sold clock and watch parts and tools. From 1764 to 1770 he advertised himself as "Clockmaker, and scientist, statesman and patriot." As a Quaker, he participated actively in civic and patriotic affairs of Philadelphia. During the American Revolution, in spite of his religious affiliation, he fought for the defense of the Colonies and was appointed Deputy Commissioner of Forage. Evidencing sincere repentance, he was permitted to rejoin the Society of Friends.

In 1769 Biddle took an active part in the preparations made by the American Philosophical Society for the observation of the transit of Venus. With Joel Baily he was sent to Cape Henlopen, Delaware, with a large reflecting telescope borrowed from the Library Company. The expedition was described in the Transactions of the American Philosophical Society in 1771 in an article entitled "An Account of the Transit of Venus, over the Sun's Disk, as observed near Cape Henlopen, on Delaware Bay, June 3rd, 1769 by Owen Biddle, Joel Baily and (Richard Thomas) Drawn by Owen Biddle." In addition to his trade in clocks and watches, Biddle also made mathematical instruments and was well known in his native city as a merchant, inventor, and ironmaster.

Early American Scientific Instruments and Their Makers

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