Differential Thermometer
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“Used to compare the temperature between two environments. As the temperature in one bulb increases, the liquid reading changes according to the air expanding within the bulb. If both bulbs are the same temperature, the scale measures zero.” —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) 215
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