Plano-Cylindrical Lens, +10 Diopter State_Solid 5A standard rheostat with oxidized

5A standard rheostat with oxidized constantan winding on a vitreous-enameled steel tube

110 ohms at 1-ohm resolution

Used to draw electrons from glass and ebonite rods during rubbing

sized for stringing through small pulley systems or hanging pendulum bobs across multiple demonstration setups

and three low-friction nylon wheels for straight-line momentum experiments

Plano-Cylindrical Lens, +10 Diopter State_Solid 5A standard rheostat with oxidizedPairs a 50 by 50mm plano cylindrical glass lens with +10 diopter optical power, focusing light along a single axis for astigmatism correction, line focus, and cylindrical optics demos.