Réaumur scale
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The Réaumur scale, also known as the "octogesimal division", is a temperature scale for which the freezing point and boiling points of water are defined as 0 and 80 degrees respectively. The scale is
Old thermometer in a pharmacy in Vienna, showing room temperature by Réaumur scale.
Réaumur and Celsius scale on thermometer. Private collection, central Europe.
A three-scale thermometer manufactured by Pichlers Witwe and Sohn in Vienna
Rankine scale
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The Rankine scale is an absolute scale of thermodynamic temperature named after the University of Glasgow engineer and physicist W. J. M. Rankine, who proposed it in 1859. As on the Kelvin scale, whic
Réaumur scale
…C x °C ≘ x × 4/5 °Ré Fahrenheit x °Ré ≘ (x × 9/4 + 32) °F x °F ≘ (x − 32) × 4/9 °Ré Kelvin x °Ré ≘ (x × 5/4 + 273.15) K x K ≘ (x − 273.15) × 4/5 °Ré Rankine x °Ré ≘ (x × 9/4 + 491.67) °R x °R ≘ (x − 491.67) × 4/9 °Ré For temperature intervals rather than specific temperatures, 1 °Ré = 1.25 °C = 2.25 °F…
W.J. Rankine