Abstract of the Means deduced from Canton’s observations, in 1759, of the variation of the needle in London. 
diurnal variation of the magnetic needle, &c. 333 
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January .. .. 
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March. 
April. 
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May.. 
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July. 
Means ..... 
August .... 
September.. 
October.... 
Means ..... 
November.. 
December .. 
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