A French brass cased Hygrometer, by Pertuis, Hulot, Bourgeois and Naudet, late 19th/early 20th century, the silvered dial with calibrated scale over mercury tube with centigrade scale, the dial engraved HYGROMETRE DE PRECISION THERMOMETRE...

A French brass cased Hygrometer, by Pertuis, Hulot, Bourgeois and Naudet, late 19th/early 20th century, the silvered dial with calibrated scale over mercury tube with centigrade scale, the dial engraved HYGROMETRE DE PRECISION THERMOMETRE CENTIGRADE 997, the glazed case with floral pierced decoration to sides and reverse, the reverse stamped PHBN, with suspension loop, 11cm diameter Provenance: with Derek Rayment, Farndon, June 1992. Please note Roseberys do not guarantee the working condition of scientific instruments offered for sale.