Manuscript, 'On the deflection of the plumb line at Arthur's Seat and the mean specific gravity of the earth' by Lieutenant Colonel [Henry] James Regards Arthur's Seat in Edinburgh, Scotland. Subject: Geodesy Published in Philosophical Transactions as 'On the deflection of the plumb-line at Arthur's Seat, and the mean specific gravity of the earth'. Received by the Royal Society on 11 February 1856. Read 21 February 1856. 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 8, 1857. 7 February 1856