477682 Ballast-heavers at work in the Pool, illustration from \'London Labour and the London Poor\' by Henry Mayhew, c.1840s (litho) by English School, (19th century); Private Collection; (add.info.: The ballast-heavers shovelled gravel (otherwise known as ballast) into the hulls of emptied colliers in order to stabalize the vessels for their return journeys. Henry Mayhew (1812-87)); English, out of copyright.