I've seen the expression 'double deed' used in 19th century newspapers to describe a double murder (e.g. in The Times, July 24 1840, p.6: 4 Dec 1892,p.9)

In the 19th c. some warships had a feature called a belt – some kind of armour plating perhaps. 'The belt is 20in. thick at the centre, tapering longitudinally to 18 in., and vertically to 16in. below the water.' (The Times, 'Her Majesty's Ship Trafalgar' 20 Sep 1887, p.13)