Diagram, 'The water barometer, standard barometer, and mountain barometer, observed simultaneously, every hour, for 15 days' by [James Hudson] Plate 22 showing a chart of mean hourly observations from a water barometer, standard barometer, and mountain barometer that were present in the hall of the Royal Society. Inscribed with publication and plate details. Ink inscription below title at top of chart reads 'July 14 to 28. 1831.' Left of the title, an inscription reads '(Mem. large)' and to left of key, '(Mem. Middle size)'. Ink inscription below chart reads '(Mem. Small) The variations of the Water Barometer are reduced to the standard of those of the Mercurial Barometers by being divided by 13.4, the sp. gr. of the Mercury'. The last portion of this sentence, 'of the standard Barometer', is struck out. Not signed. Watermarked 'B&T Sweetapple 1827'. The manuscript for this paper is wanting. Subject: Meteorology Published in Philosophical Transactions as part of paper titled 'Hourly observations on the barometer; with experimental investigations into the phenomena of its periodical oscillation' by James Hudson. Read to the Royal Society on 21 June 1832. [July 1831]