'Hydraulics', late 19th century.
© Science Museum / Science & Society Picture Library
Coloured etching by H Heath, depicting a street trader offering 'patent shower and slipper baths' to a couple of somewhat unenthusiastic looking customers. Two women are observing proceedings from windows overlooking the street. One of them is pouring water from a watering can onto an angrily gesticulating man standing below. The illustration's full title is 'Hydraulics - the Science of that Philosophy which treats of the Motion of Fluids and the Art of Conveying Water'. Published by S Maunder, 10 Newgate Street.