Blackwell's Island Penitentiary, New York: prisoners in chains are working with hammers breaking stones on the side of the roadway, a guard in a jacket and trousers with a cane is watching over them from under a tree. Wood engraving after G.U. Régamey.

Licence: Public Domain Mark

Credit: Blackwell's Island Penitentiary, New York: prisoners in chains are working with hammers breaking stones on the side of the roadway, a guard in a jacket and trousers with a cane is watching over them from under a tree. Wood engraving after G.U. Régamey. Wellcome Collection. Source: Wellcome Collection.