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Rare work on magnetic variation
By CHURCHMAN, John, 1804
Rare chart of the world showing lines of magnetic variation
By YEATES, Thomas, 22nd, August, 1817.
Magnetic variation in the Atlantic and Indian Oceans
By BELLIN, Jacques-Nicolas, 1765 [but 1792-1804].
A presentation copy of the last gasp for Edmund Halley’s theory for the determination of longitude by magnetic declination
By CHURCHMAN, John, 1790.
Blaeu’s first edition of navigational tables for determining magnetic variation
By BLAEU, Willem Janszoon, c.1627-38.