Optically Worked Double Concave Glass Lens, 75mm Diameter, 200mm Focal Length Face Size_38mm 9-inch inner diameter with a

9-inch inner diameter with a 5

equipping a class for fixed-and-movable pulley investigations

open at one end for mercury barometer construction and atmospheric pressure demonstrations

Neoprene Bunsen burner hose sized to fit 8-10 mm gas-inlet connectors

Air condenser in borosilicate glass measures 20cm with 19/26 ground joint for high-boiling-point reflux and organic chemistry procedures

Optically Worked Double Concave Glass Lens, 75mm Diameter, 200mm Focal Length Face Size_38mm 9-inch inner diameter with aPairs 75mm of aperture with a 200mm diverging focal length on a double concave glass lens, the gentler curvature softening divergence for clearer virtual image observation in refraction setups.