Similar Items

• Instructions at large, for the use of Hadley's quadrant : wherein are contained the principles on which that most ingeniously contrived, and useful instrument is constructed; together with a description and use of Vermier's, enormously called Nonius's divisions
  Published: (1766)
• The nature and use of Hadley's quadrant : with a preface containing the theory, on which that noble and useful instrument is founded. And a description of the nonius
  Published: (1790)
• Directions for the use of Hadley's quadrant : with remarks on the construction of that instrument. By the Reverend Mr. Ludlam
  by: Ludlam, William
  Published: (1771)
• Directions for the use of Hadley's quadrant : with remarks on the construction of that instrument. With considerable corrections and additions. By the Reverend Mr. Ludlam, Late Fellow of St. John's College, Cambridge
  by: Ludlam, William
  Published: (1790)
• Useful, easy, directions for seamen, who use Hadley's quadrant : Shewing, to the meanest capacity, how to hold the quadrant to take the Fore and the Back Observations of the Sun and of a Star; and the Meaning of the Observations. How to examine whether the Index-Glass, and the Fore and Back Horizon-Glasses, stand in a right Posture; and how to set them right when they do not stand right. The Meaning of what is called the Dip of the Horizon, or the Height of the Eye above the Water; and how to find it by the Quadrant. The Meaning of what is called the Resraction of the Air, and how to prove it. Many other very necessary Things, which every Seaman, who uses the Quadrant, should understand, if he be desirous of knowing the Meaning of what he is about. A Book of this Sort has been much desired by some Seamen, and it may be very useful to many
  Published: (1772)