Astronomy: a diagram showing how to determine longitude. Coloured engraving by J. Emslie, 1851, after himself.
Wellcome Collection

Astronomy: a diagram showing how to determine longitude. Coloured engraving by J. Emslie, 1851, after himself.

John Emslie · 1851

CC0 — Public Domain
Wellcome Collection

Lettering: Methods of ascertaining the longitude.

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