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A bell being included under a Receiver, which being shaken to make the Clapper, strike, it was.very observable that the Interposition of the Glass betwixt the Bell and the Ear, was a great obstruction to its Sound, notwithstanding it was audible at some good distance from it: But gradually withdrawing the Air, and making several Stops to shake the Bell at different Degrees of Rarefaction, the Diminution of the Sound at every Stop was very distinguishable.

VIII. An experiment made at a meeting of the Royal Society, touching the diminution of sound in air rarefy'd