PNHB Hygrometer

Late 19th century Hygrometer by PNHB, Paul Naudet, France. Hair movement and curved mercury thermometer. Index hand is unusual to find on a hygrometer. Silvered dial and brass case. Great decorative ventilation piercings. Tracks humidity reasonably well against my modern precision hygrometers. The nicest antique hygrometer I have ever offered. Measures approx 4.25" diameter by 1.25" deep.