Unpublished diagrams, angles of pressure on heavy bodies by C [Charles] Bonnycastle Figures 1-8 showing various angles of pressure on heavy bodies used in construction. Figure 5 is drawn separately and pasted onto sheet with other figures. Subject: Physics / Engineering Written by Bonnycastle in Woolwich Common [London]. Communicated by Sir Jos [Joseph] Banks. Read to the Royal Society on 11 March 1819. Whilst this paper was not abstracted in the Proceedings of the Royal Society, a mention of its reading at a meeting of the Society was published in the Annals of Philosophy: 'Article III. Proceedings of Philosophical Societies'. Annals of Philosophy, vol 13, no 76, 1819, p. 307. 26 October 1818