"Measures atmospheric pressure. Pressure from the atmosphere compresses the mercury in the tray forcing the mercury accordingly into the graduated tube." —Quackenbos 1859
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) 171
