A new treatise on the practice of navigation at sea : containing all the details necessary to enable the mariner to become a good practical navigator. (1902)
Thoms, William · New York : Printed for the author and sold by John Bliss & Co · leaf 69
and when it falls rapidly to 29.50, the weather threatening, and the clouds of a bluish,gloomy appearance, the Ship is then on the verge of the Storm Circle, and the Focus may be at least150 miles distant. As the Focus is approached the Barometer will fall to 29.20 inches at 100 milogdistant; to…
Navigation · Nautical astronomy
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