Hancock R, Very Rare 18th century View of The Waterfall of Niagara, A 'perspective view' of Niagara drawn by Hancock, by Robert Sayers' view published in London, circa 1751-1770, which in turn derived from the view of the falls first published in Louis Hennepin, Nouvelle decouverte, Utrecht, 1697. Robert Sayer (1735-1774) England, approx 23 cm x 38.5 cm