@article{548665,
      note = {"Designed as a supplement to the Directions for the use of  Hadley's quadrant".},
      author = {Ludlam, William,},
      url = {http://library.usi.edu/record/548665},
      title = {The theory of Hadley's quadrant, or the rules for the  construction and use of that instrument demonstrated. By  the Reverend Mr. Ludlam. [electronic resource] :},
      publisher = {printed by R. Hett, and sold by T. Cadell, in the Strand,},
      recid = {548665},
      pages = {[4],30p.,plates ;},
      address = {London :},
      year = {1771},
}