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 49
in the course of this day there was some¬ thing in the atmosphere which distorted objects into very curious shapes. The principal feature in this phenomenon was a constant waving tremulous motion near the horizon, causing the whole body of ice to appear at times as if turning round, and making one… … when its real outline, when not thus distorted, was this,— The tremulous appearance is, in a greater or less degree, a very common phenomenon in the Polar Seas. Such, indeed, is the frequent occurrence of extraordinary and variable terrestrial refraction, and the consequent uncertainty with respect…
Compass · Magnetic declination · Navigation
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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