Unpublished paper, 'An account of certain experiments made with a view of determining the law of attraction between iron and a magnetic compass needle' by P [Peter] Barlow Paper by Barlow recounting experiments to determine the law of attraction between iron and magnetic compass needles. His distils his findings into four rules that can be used to calculate the effect of the local attraction of a ship upon a compass at any location where the dip of the magnetic needle is known. Includes two illustrations. Annotations appear throughout in graphite. Pages 1-9 are missing from the manuscript. Subject: Physics Written by Barlow at the Royal Military Academy in Woolwich [London]. Read to the Royal Society on 27 May 1819. 10 May 1819