THE ACCURACY OF OBSERVATIONS MADE WITH MARINE SEXTANTS

Charles H. Smiley

Peer Reviewed

Abstract:	In a recent study of atmospheric refraction at low angular altitudes, a few observers have made some 35,000 measures of the sun’s vertical diameter as well as several thousand measures of the altitude of the sun’s lower limb. The instruments used were modern American endless-tangent-screw marine sextants equipped with telescopes of 3x magnification. This paper will present briefly some of the information concerning observers and sextants which has been brought to light by this work.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 2, Number 10
Pages:	342 - 347
Cite this article:	Smiley, Charles H., "THE ACCURACY OF OBSERVATIONS MADE WITH MARINE SEXTANTS", NAVIGATION: Journal of The Institute of Navigation, Vol. 2, No. 10, 1951, pp. 342-347.
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