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A Bell being included in a Brass Recipient, and plac’d at one end of a Room, about 50 yards in length: At the other end of which stood some Gentlemen to observe the found; which before any Air was intruded, the Bell upon shaking was heard at that distance, tho not without diligent attention.

philosophical transactions of the royal society of london

VII. An account of an experiment made at a meeting of the Royal Society at Gresham college, upon the propagation of sound in condensed air. Together with a repetition of the same in the open field, by Mr F. Hauksbee