Copper engraving, 25.5 x 39.5 cms, engraved by Edward Rooker after Canaletto, black and white, mounted in the nineteenth-century, blank verso. Originally published by Robert Sayer circa 1751 - Sayer commissioned Canaletto to produce a series of drawings of London subjects on his second visit to the city. The ruined viaduct is painted on a backcloth, screening the paying public from the reality of the fields beyond.