The navigator's guide, to the Oriental or Indian Seas: : or, the description and use of a variation chart of the magnetic needle, designed for shewing the longitude, throughout the principal parts of the Atlantic, Ethiopic, and Southern Oceans; within a degree, or sixty miles. With an introductory discourse, concerning the discovery of the magnetic variation, the finding of the longitude thereby, and several useful tables. /
Dunn, Samuel,-1794.
London: : Printed for the author; and sold by him. Likewise sold by H. Gregory, Leadenhall-Street; T. Newman, in Exeter 'Change; A. Smith, near Charing Cross; mathematical instrument-makers. ... ,
[1775]
Dedication dated: 10 Nov. 1775.
ESTC
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Magnetic declination