220V Spectrum Tube Power Supply with Safety Door, US Standard Subcategory_Alternative Energy letting instructors tailor voltage to

letting instructors tailor voltage to light sources and experiment-specific requirements

One-meter single-wire potentiometer with 24 SWG constantan wire stretched along a millimeter scale

Six replacement gold leaves cut to fit the standard gold-leaf electroscope

and adult stages for metamorphosis and life-cycle teaching

and small motor circuits without bare-terminal hazards

220V Spectrum Tube Power Supply with Safety Door, US Standard Subcategory_Alternative Energy letting instructors tailor voltage toA safety door interlock prevents contact with energized electrodes by cutting power whenever the door opens, providing 220V excitation for atomic emission spectroscopy tubes.