The firm of Maudslay, Sons and Field was founded in 1798 by Henry Maudslay (1771-1831), father of the machine tool industry and one of the greatest engineers of the Industrial Revolution. He was succeeded by his son Joseph Maudslay (1801-1861) in partnership with Joshua Field. The business specialised in marine engines. The present drawing is by an unknown hand in Maudslay’s workshop, and is of a beam engine and low pressure Cornish boiler complete with tall iron chimney, combined as a unit and mounted on castors.