A 4^th order Fresnel dioptric drum lens by F. Barbier & Cie, Paris, dated 1893.

250 mm focal length.

Maker’s plate marked: F. BARBIER & Cie. Constructeurs PARIS – 1893

Height: 46 cm.

Diameter: 62cm.

Frédéric Barbier & Cie, Rue Curial, 19^e arr^t. Paris, France. Later part of Barbier, Benard, et Turenne (BBT).