This is an antique Bausch & Lomb adjustable map/chart/print magnifier. It is a tripod shaped circular blackened brass magnifier. The rim is incised with Bausch & Lomb, Rochester, N.Y. The inner circular brass threaded piece elevates and encases the loose accessible lens. There is some rubbing to the surface edges. It is in fine, excellent condition. It is 1 3/4" x 1 3/4." SC.
Antique Bausch & Lomb Adustable Map/Chart/ Print Magnifier