KONUS

spectacles and spectacle frames, lenses and magnifying glasses; prisms (for scientific purposes); concave optical mirrors; monocles, binoculars, field-glasses, telescopes, microscopes, magic lanterns, thermometers, barometers, barographs, hygrometers, aerometers, directional compasses, densimeters, ebullioscopes, anemometers, laboratory test-tubes, curvometers, tachometers, pedometers, laboratory calipers, measuring compasses, altimeters, cameras, cinecameras, slides for projections and films