Manuscript, 'Observations and experiments on the daily variation of the horizontal and dipping needles under a reduced directive power' by Peter Barlow Subject: Magnetism Published in Philosophical Transactions as 'Observations and experiments on the daily variation of the horizontal and dipping needles under a reduced directive power'. Communicated by Davies Gilbert. Read 12 June 1823. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 2, 1833. [1823]