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Rev. William Mitchel on his improved quadrant, 1787 - 1788

 Item
Reference Code: GBR/0180/RGO 14/38: 117-133

Scope and Contents

Papers and three letters, chiefly concerning Mitchel's improved quadrant and its use for the four most important operations in navigation: finding the variation of the needle at sea, finding the latitude at sea, finding the apparent time at sea, and finding the longitude by Jupiter's satellites or the moon. In the final letter of the series, dated 14 July 1788, Mitchel states that he had 'laid aside' his quadrant method and now proposed a method of finding longitude by the stars or by the satellites of Jupiter [RGO 14/38: 133].

Dates

  • 1787 - 1788

Conditions Governing Access

Unless restrictions apply, the collection is open for consultation by researchers using the Manuscripts Reading Room at Cambridge University Library. For further details on conditions governing access please contact mss@lib.cam.ac.uk. Information about opening hours and obtaining a Cambridge University Library reader's ticket is available from the Library's website (www.lib.cam.ac.uk).

Extent

17 folio(s) (17 ff.) : Paper

Language of Materials

English

Originator(s)

Mitchel, William

Finding aid date

2011-12-07 17:59:09+00:00

Creator

Repository Details

Part of the Cambridge University Library Repository

Contact:
Cambridge University Library
West Road
Cambridge CB3 9DR United Kingdom


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