Some systems used a bimetallic thermometer in the sun and a mercurial instrument in the shade.
"The Introduction of Self-Registering Meteorological Instruments"
Robert P. Multhauf
Oh bimetallic champion, some New ratio doth seem proper, When the circulating medium Has fallen to half a copper.
"Fringilla: Some Tales In Verse"
Richard Doddridge Blackmore
For some years influential silver advocates had been associated in the bimetallic League, an organization which supported the free coinage of both gold and silver.
"The United States Since The Civil War"
Charles Ramsdell Lingley