Details
A rare lacquered-brass Wheatstone-pattern photometer,
signed on the drum Secretan á Paris, with gearing and winding handle, with an instruction leaflet in German, in chamois-leather-lined case -- 2 5/8in. (6.6.cm.) high
See Illustration
signed on the drum Secretan á Paris, with gearing and winding handle, with an instruction leaflet in German, in chamois-leather-lined case -- 2 5/8in. (6.6.cm.) high
See Illustration