Measured drawing of the chain bridge, Llantysilio. One of a set of detailed survey drawings of this bridge which were carried out by the French Industrial spy, J. Dutens, in 1819.
From: Dutens J: Memoires sur les travaux publiques de l'Angleterre (Paris: Imprimerie Royale, 1819)
pp. 169-170 Plate 9 – Pont de chaines (fold out drawing to rear of book)