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Terrestrial magnetism.
Churchman, John. -1805.
‘The magnetic atlas, or variation charts of the whole terraqueous globe, comprising a system of the variation and dip of the needle, by which the observations being truly made, the longitude may be ascertained.
London: Printed for the author, by Darton and Harvey;... MDCCXCIV. vii, (1), 80 pp. Diagrams. L.8°. **Adams 83.14
Same. 3d edition. New York. Gaine & Ten Eyck. 1800. vii, (1),
76 pp. 5960.15
This card was printed at the Boston Public Library, June 23, 1909. Go275 — Terrestrial magnetism. — Longitude.