EXPERIMENT VIII.
* 1.1WE took a Glass Alembick, which was large enough to hold about Three Pints, represented by the Seventh Figure; The Rostrum (E) being hermetically closed: In the Top of the Rostrum was a Hole, into which, one of the shanks of a Stop-Cock of an ordinary size was cemen∣ted, the other being fixed with Cement in the upper Part of the Pump; which being done, and the upper Orifice of the Alembick being cove∣red close with a Plate of Lead exactly adapted to it, upon drawing the Air out of the Receiver the Glass presently cracked; which Crack is re∣presented by the Line (a, b) and this Flaw ex∣tended it self further accordingly as the Air was more exhausted, yet this Glass Vessel was near twenty times thicker than the Bubble.
And that the Figure of the former Glass ena∣bled it so much better to sustain the Atmosphere, was further confirmed by suspending one of the Bubbles hermetically sealed in the Receiver, which so strongly resisted the Expansion of the Air contained in it, as to continue whole, when the Receiver was exhausted.