Pocket Thermometer In Silver From Couvoisier & Comp. Ca. 1820

Rare silver bimetallic thermometer, fine enamel dial with graduations in Fahrenheit and Reaumur and indications "Degrees du chaud" et "Degrees du froid à Paris" and common references for temperatures "Glace, Oranger, Tempère, Serres Chaud, Chambre Malade, Vers a Soye, Bains, Chaleur. Humaine, Sénegal, Sirie" and very high and low temperatures from the past, 1753 (+30 R), 1788 (-18 R), 1709 (-17 R), 1776 (-15 R), 1740 (-10 R)
Courvoisier & Comp established in 1811. Louis Courvoisier's second wife was Julie Houriet, a niece of Jacques Frédéric Houriet, who was the inventor of the bimetallic thermometer.