A magnetic dry-card compass of a type patented by Henry Jennings in 1818 (no. 4259). The compass bowl is made of brass. The card is mica covered with paper, and is marked in points, with a fleur-de-lys at north. The…
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- The Board of Longitude
The Board of Longitude
These are all objects connected in some way with the Board of Longitude, the name generally given to the group of Commissioners established by the 1714 Longitude Act to assess and reward ideas for solving the problem of finding longitude at sea. By the late eighteenth century, the Board was also judging a much broader range of projects relating to navigation more generally. There are three groups of instruments here. The first is of instruments submitted to the Board in the hope of gaining a reward under the terms of the various Longitude Acts and includes timekeepers, compasses and instruments for navigation by dead reckoning. The second comprises items such as timekeepers that were commissioned or purchased by the Board. The third includes instruments used on expeditions that the Board supported.