|Title||Letter, 'Diurnal variation of the magnetic needle on the island of St Helena and Sumatra' from John MacDonald to Joseph Banks|
|Date||30 September 1798|
Published in Philosophical Transactions, as 'Observations of the diurnal variation of the magnetic needle, in the Island of St. Helena; with a continuation of the observations at Fort Marlborough, in the Island of Sumatra'
Read 24 May 1798
|Physical description||Ink on paper|
|Related material||DOI: 10.1098/rstl.1798.0019|
Fellows associated with this archive
|NA8116||Banks; Sir; Joseph (1744 - 1820); Naturalist||1744 - 1820|