A description of a new instrument or celestial compass : adapted for ascertaining the latitude and longitude at sea, by means of the declination and right ascension of the heavenly bodies : for finding the deviation of the magnetic needle, ... as also, for taking bearings and surveying without magnetic aid (1825)
Graydon, George · London : Printed by S. and R. Bentley ... · leaf 63
Compass · Magnetic declination · Navigation
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
