Wheel Barometer
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“As the mercury rises and lowers in the barometer, the float F turns the index, I. Index I points to the correct reading on the graduated scale S.” —Quackenbos 1859
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Chemistry ApparatusSource
G. P. Quackenbos A.M. A Natural Philosophy: Embracing the Most Recent Discoveries in the Various Branches of Physics, and Exhibiting the Application of Scientific Principles in Every-day Life (New York: D. Appleton and Company, 1859) 172
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