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Funding for digitization provided by The Andrew W. Mellon Foundation
Variation of the Compass – Description of the Azimuth Compass – Use of the Aximuth Compass – To find the Variation by an Amplitude – To Find the Variation by an Azimuth – To Find the true Azimuth by Another Method
New and Complete Epitome of Practical Navigation
Norie, J. W. 1828