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TO make it appear, that the round Figure of a Body enables it to resist a more vio∣lent Pressure from the Atmosphere, than Bodies otherwise shap'd; We made use of a Brass Hoop, about 3 Inches high, and 3 Inches and 2/10 in Dia∣meter, and Cementing a round Piece of Glass upon the one Orifice, the other was joyn'd to the Receiver with Cement; and upon drawing out
the Air, the Atmosphere press'd so strongly up∣on the Glass, as to burst it asunder with a con∣siderable Noise, like that of a Pistol. How far this may contribute to account for the Noise which accompanies the Explosion of Gunpow∣der in Pistols, we leave others to consider.