De Saumarez, Henry, b. ca. 1655.

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A letter to a friend, setting forth the case of the author of the marine surveyor . Being an instrument design'd for the improvement of navigation, and for correcting many errors in that useful art, on which the happiness of Great Britain so much depends.
De Saumarez, Henry, b. ca. 1655.Date: 1725
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An account of the proceedings of Henry De saumarez, of the island of Guernesy, gent . Concerning his discovery of an invention, by which the course of a ship at sea may be better ascertained than by the logg-line, viz. By a dial placed in some convenient place of the ship, with a little bell striking from time to time, the geometrical peaces, miles, and leagues, which the shiphath run.
De Saumarez, Henry, b. ca. 1655.Date: 1717