Optical Glass Lens for Top Spinning Base, 3" Light & Optics_Spectroscopy Reproduces Ewald von Kleist's 1745

Reproduces Ewald von Kleist's 1745 charge-storage device with concentric metal cups around a plastic dielectric

Liquid propane Bunsen burner adds a flame stabilizer and adjustable air vent for consistent

and 500mm focal lengths for comparative refraction experiments

Glass equilibrium tubes with plastic base demonstrate pressure equilibrium

and permittivity

Optical Glass Lens for Top Spinning Base, 3" Light & Optics_Spectroscopy Reproduces Ewald von Kleist's 1745Double concave glass lens at 3 inch diameter and 200mm diverging focal length, ground to polished beveled edges and usable as a top spinning base in secondary mechanics demonstrations.