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When the wheel revolves upon its axis, which is performed in this machine every revolution in about half a second, theaAir may be considered as divided into as many concentrical circumferences as there are particles of air contained between the least and the greatest circle

philosophical transactions of the royal society of london

II. A calculation of the velocity of the air moved by the new-invented centrifugal bellows of 7 feet in diameter, and 1 foot thick within, which a man can keep in motion with very little labour, at the rate of two revolutions in one second