'A further Account of a new machine call'd the marine Surveyor design'd for the Mensuration of the Way of a Ship at Sea more correctly than by the Log at present in Use, or any other Method hitherto invented for that Purpose by M Henry de Saumarez of the Island of Guernsey, part of his Majesties ancient Dutchy of Normandy' Engraving of the ship with new machine from 'Philosophical Transactions' attached Read to the Royal Society on 23 January 1728 1728