Paper, 'An account of a new machine, called the marine surveyor, contrived for the mensuration of the way of a ship in the sea more correctly than by the log, or any other method hitherto used for that purpose' by Henry de Saumarez De Saumarez outlines the advantages of the new machine which he designed after a series of experiments. Subject: Scientific apparatus and instruments / Navigation Read to the Royal Society on 16 December 1725 Published in Philosophical Transactions as 'A further account of a new machine, called the marine surveyor, designed 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 Mr. Henry De Saumarez, of the Island of Guernsey, part of His Majesty's antient Dutchy of Normandy' 1725