Drawings, sections through axis and telescope by [T Bradley] Plate 18, figures 8-9 showing sections through the transverse axis of South's transit and a section through the axis of the telescope itself. Inscribed with publication, plate details, and a scale. The published version of this plate is in portrait orientation, with figure 8 above figure 9. Not signed. Royal Society stamp verso. Subject: Astronomy Published in Philosophical Transactions as part of paper titled 'On the discordances between the sun's observed and computed right ascensions, as determined at the Blackman-street Observatory, in the years 1821 and 1822; with experiments to show that they did not originate in instrumental derangement. Also a description of the seven-feet transit with which the observations were procured, and upon which the experiments were made' by James South. Read to the Royal Society on 8 June 1826. [1826]