One eyepiece barrel is marked “Docteur / Arthur Chevalier” and the other “Paris / 158 Palais Royal.” The objective lenses are 30 mm diameter. The frame is black metal. The barrels are covered with black leather. A center wheel adjusts the focus.
Arthur Chevalier (1830-1874) began in business around 1860, taking charge of the optical firm begun by his grandfather, Charles Chevalier, and continued by his father, Louis Vincent Chevalier. M. Avizard bought the firm in 1881.
Ref: Arthur Chevalier, Catalogue Explicatif et Illustré des Instruments d’Optique et de Météorologie (Paris, 1860), pp. 16-20.
Paolo Brenni, “19th Century French Scientific Instrument Makers. II: The Chevalier Dynasty,” Bulletin of the Scientific Instrument Society 39 (1993): 11–14.
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