The plate illustrates section III (pp.69-70), 'An Experiment shewing the Difficulty of separating two Hemispheres, upon the injecting an Atmosphere of Air on their outward Surfaces, without exhausting the included Air'. Plate IIII from Physico-mechanical experiments on various subjects, by Francis Hauksbee (London, 1709), presented to the Royal Society by the author on 26 October 1709. Hauksbee (ca.1660 Ã» 1713) was elected a Fellow of the Royal Society in 1705, and was the Society's Curator of Experiments from 1703 to 1713.
Original: copperplate engraving. 1709
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Hauksbee's experiment on air pressure appears in: