Finding the Error of the Marine Compass on Board Ship

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. So much of the Text, comprising nearly all of one Chapter, together with the entire set of Tables, as here given, from the Manual of the Marine Compass, in course of preparation by the undersigned, it has been deemed expedient to print, in advance of its general publication, for the immediate use of the United States Navy.