Antique French Holosteric Library Barometer

Nineteenth-century holosteric library barometer with "PHBN" logo (Pertuis, Hulot, Naudet), the French maker. Copperish brass case with hanging ring. Faceplate is segmented to thirty-one degrees.

Weight:    1 lb.
Overall Dimensions:    5"Diameter x 5"D
Made:    France
Material:    Brass
Date:    1890