The mathematical theory of the deviations of the compass : arranged for the use of the Cadets at the U. S. Naval Academy

The Smithsonian catalogs The mathematical theory of the deviations of the compass : arranged for the use of the Cadets at the U. S. Naval Academy as books in its Compass records.

WHY IT’S INTERESTING

Taken from the English Admiralty manual for the "Deviations of the compass." (Pref.)

SERENDIPITYA little unexpected

FamiliarWeird

A CLOSER LOOK

The Smithsonian lists the object under Compass and dates it 1879.

Taken from the English Admiralty manual for the "Deviations of the compass." (Pref.)

FOLLOW THE EVIDENCE

Smithsonian InstitutionThe mathematical theory of the deviations of the compass : arranged for the use of the Cadets at the U. S. Naval Academy

Original explanation based on the sources above. Images carry their own reuse terms.