Similar Items

• Improvements in the methods now in use for taking the longitude of a ship at sea : Invented and described By Samuel Dunn, teacher of the Mathematics, London
  by: Dunn, Samuel
  Published: (1793)
• An introduction to latitude without meridan altitudes; and longitude, at sea; having cotemporary [sic] observations: ... and nautical formulas, engraved on copper plates. By Samuel Dunn
  by: Dunn, Samuel
  Published: (1782)
• The method of finding the longitude at sea : by time-keepers: to which are added, tables of equations to equal altitudes. More extensive and accurate than any hitherto published. By William Wales, F. R. S. And Master of the Royal Mathematical School in Christ's Hospital
  by: Wales, William
  Published: (1794)
• The linear tables described : and their utility verified; with precepts and examples for shortening calculations and preserving accuracy, in the lunar method of finding longitude at sea. By Samuel Dunn, Teacher of the Mathematical Sciences
  by: Dunn, Samuel
  Published: (1783)
• A new sett of logarithmic solar tables : calculated and constructed for determining the latitude at sea, by Taking two Altitudes either in the Forenoon or Afternoon, with the intermediate Time by a common Watch; and that with Ease and Accuracy, independent of the Sun's Meridional Altitude. This Most Excellent and Useful Performance, does not only produce the true Latitude at any Time between Nine O'Clock in the Morning, and Three in the Afternoon; but also gives the true Time of the Day, when the greatest Altitude was taken to thirty Seconds by the Tables; and if a greater Degree of Accuracy is required, the same may be done by taking Proportional Parts. Whence the Sun's true Azimuth may be determined by One single Proportion
  Published: (1759)