Ross, John, Sir, 1777 - 1856 (Knight, Rear-Admiral, Arctic Explorer)
Found in 1 Collection or Record:
Captain John Ross on the variation of the compass, 1818 - 1819
Reference Code: GBR/0180/RGO 14/42: 317-327
Scope and Contents From the File:
Correspondence regarding the effects of magnetic variation on the mariner's compass, the use of magnetic variation to establish longitude and the cause of magnetic variation.
Dates: 1818 - 1819
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