Context

Context of Analysis of the authorities upon which the dangers have been inserted in Blunt's new chart of the Atlantic, or Western Ocean. : To which is added, an accurate table of the variations of the magnetic needle, as observed in different parts of that sea; with the dates of the respective observations. : And a series of experiments and observations, tending to prove, that by ascertaining the relative heat of the sea-water, by use of the thermometer, from time to time, the passage of a ship through the Gulph stream, and from deep water into soundings, may be discovered in time to avoid danger, although (owing to tempestuous weather, ) it may be impossible to heave the lead or observe the heavenly bodies. : With an exhibition of facts, showing the progress of ice islands from Greenland to Newfoundland, &c.&c.
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