G.W. Blunt White Library
New and Complete Epitome of Practical Navigation - Norie, J. W.
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
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* Funding for digitization provided by: The Andrew W. Mellon Foundation