The description, use, and excellency of a new instrument, or sea quadrant, invented by Caleb Smith, for taking altitudes of the sun, moon, and stars, from the visible horizon ... without impediment ... from the ship's motion; ...
Smith, Caleb,active 1740.
London : to be had of the inventor, at his office for insuring ships and merchandize; or at the Crown Coffee-House, near Guildhall,
[1740?]
ESTC