@article{573816,
      note = {Reproduction of original from British Library.},
      author = {Smith, Caleb,},
      url = {http://library.usi.edu/record/573816},
      title = {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 (as well as any other Angular Distances at Land or  Sea) without impediment or Interruption from the ship's  motion; whereby the Latitude at Sea May be obtained with  greater Certainty, and more frequently, than by Davis's or  any other of the Common Instruments. Tried, approved, and  recommended by Capt. Christopher Middleton, Capt. George  Spurrel, Capt. Joseph Harrison, and several other able and  experienced Navigators. To which is added, An Essay to make  this Quadrant serviceable at Sea, as well as at Land, when  there is no Horizon to be seen. As also The Usefulness of  its Application to an Aximuth Compass of a New Contrivance  for discovering the Variation of the Magnetic Needle, at  Sea, without any Astronomical Calculation. [electronic  resource] :},
      publisher = {to be had of the inventor, at his office for insuring  ships and merchandize, in Castle-Alley, over-against the  West Passage of the Royal Exchange; or at the Crown  Coffee-House, in King-Street, near Guildhall, London,},
      recid = {573816},
      pages = {24p.,plates :},
      address = {London :},
      year = {1740},
}