✦ LIBER ✦

Observations of the Diurnal Variation of the Magnetic Needle at Fort Marlborough, in the Island of Sumatra. By John Macdonald, Esq. In a Letter to John Crisp, Esq. F. R. S.

✍ Scribed by Macdonald, J.

No coin nor oath required. For personal study only.

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