Description

This pair of opera glasses has curved tapering aluminum barrels, covered with panels of brownish-colored mother-of-pearl.  The objective lenses are achromatic triplets, contained in aluminum cells.  It has aluminum tubes, triplet eyepiece lenses, and flared eyecups, made of segments of mother-of-pearl.  The frames and all other metal parts are made of aluminum, which was considered very valuable at the time.  Focusing is done with a thumbwheel, also made of mother of pearl.  Inscribed on the aluminum cross piece nearest the eyecups is "12 lenses," referring to the total number of lenses, 4 times three triplets.  It is signed "LeMaire Fabi   Paris" on the face of both eyecups.