Pyrometer

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“As temperature elevates, the metal bar being tested expands accordingly and the dial measures the expansive power per degree of heat.” —Quackenbos 1859

Source

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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