3 high power microscope eyepieces by Ross of London, circa 1880.
Each marked: D, E, and D KELNER’S ORTHOSCOPIC ROSS, LONDON.
D: 4 cm.
E: 3 cm.
D: 3.3 cm. engraved: KELNER’S ORTHOSCOPIC ROSS, LONDON.
With an earlier brass objective canaster marked: A Ross Optician (LONDON). Diameter: 2.5 cm