1853 R. S. Hawker (1893) 28 There's a nine-knot breeze above.
1896 R. Kipling 146 It paid, I tell you, it paid, When we came with our nine-knot freighters and collared the long-run trade!
1994 (Nexis) 26 June 2 Radar speed traps are being set up by British Waterways..to catch water skiers who break the nine-knot speed limit.