REMARKABLE COMPACT ALL-TRIPLE-LENS BINOCULARS, French, c. 1875, engraved “Douze Verres” (for “Twelve Lenses”) and signed in the case “Gregoire Opticien, Quai St. Antoine, 14.” Measuring 3-7/8″ (10 cm) overall and 1-1/8″ (3 cm) thick (closed), they are constructed of gilt brass, with a central knurled focusing knob. Each objective lens, and each eyepiece, is itself a triplet, a sophisticated design to minimize aberrations and permit a compact, short-focal-length instrument. The apparent maker was Gregoire of Lyon, working throughout the
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