William Cragg on longitude by a ship's reckoning, 1818 - 1828
Scope and Contents
Eight letters from Cragg concerning his proposal for finding longitude by a ship's reckoning using a compass and charts, without the assistance of celestial lights or books of calculation. Includes charts for sailing [RGO 14/39: 53] and [RGO 14/39: 68v].
- 1818 - 1828
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22 folio(s) (22 ff.) : Paper
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