Unpublished paper and letter, 'The circle' by Smith Swan Swan writes about the properties of the circle and the rules that underpin its geometry. He includes lengthy calculations relating to diameters and circumferences of circles. Includes two sets of illustrations in the text. Preceded by a covering letter to Sir Joseph Banks [who had died in 1820]. Subject: Mathematics Written by Swan in Bildeston near Hadleigh, Suffolk [England]. [1826]