Scale: 1:24 and 1:12. Plan showing an elevation with pump details for the pumping system as designed by Captain Truscott, and fitted to Havock (1805), a 14-gun Brig Sloop. The plan illustrates how the water in the barrels in the hold was pumped to the upper deck, and how water could be pumped from Water Lighters to the barrels in the hold. See ZAZ6849 for the same system on HMS Ramillies (1785).

Signed by Henry Canham [Master Shipwright, Sheerness Dockyard, 1813-1817].