Philadelphia: Printed and Sold by R. Aitken, 1799. xii, 98, , [1 blank] pp., lacking the folding map. Errata at the bottom of page 98. Disbound, light wear, Good+.
"A scientific treatise advancing the idea that sandbanks could be discovered by using the thermometer... Benjamin Franklin's grand-nephew, Jonathan Williams, was the son of Jonathan Williams and Grace Harris Williams, daughter of Benjamin Franklin's sister, Anne. Williams along with his brother were [sic] sent to London in 1770 to complete their training and make contacts under Franklin's tutelage. Franklin was impressed by his diligence and the two remained close over the years. Williams lived abroad until his return to America with Franklin in 1785. In 1796 he became an associate judge in the court of common pleas, and gained a reputation as a scientist. He worked with his uncle on some of his later experiments. He also contributed to the Transactions of the American Philosophical Society, where he served at various times [as] secretary, councillor, and vice-president" [Christie's description, 2007 auction].
Evans 36722. Rink 3893. ESTC W7573. Item #36167