Spare Filament Lamp for Optical Bench, 12V 20W, 5-Pack engine models Built from two counter-rotating foil-sectored

Built from two counter-rotating foil-sectored plates with a belt drive and a pair of Leyden-jar condensers

motorized throttle

Large-capacity and short-form in autoclavable polypropylene

Designed to measure Planck's constant through the photoelectric effect

Two-amp low-voltage power pack delivering 6 to 12V AC for optical benches and demonstration apparatus

Spare Filament Lamp for Optical Bench, 12V 20W, 5-Pack engine models Built from two counter-rotating foil-sectoredFive filament bulbs rated 12V 20W, sized to fit standard optical bench lamp houses and stocked together so a burned out lamp does not stall an experiment.