Unpublished diagrams, placement of compasses near walls by W [William] Scoresby Figures 1-2 showingthe placement of compasses in relation to walls so as to determine their thicknesses. Subject: Physics / Engineering Read to the Royal Society on 16 June 1831. Whilst the Royal Society declined to publish this paper in full, an abstract of the paper was published in volume 3 of Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society] as 'On the determination of the thickness of solid substances, not otherwise measurable, by magnetic deviations'. [1831]