Jolly's Photometer Build to Order and resonance experiments

and resonance experiments

rated for student circuit construction and series-parallel investigations where junction-voltage and current-limiting concepts get introduced

letting students drive the lamp directly or send the slow AC output to a meter or oscilloscope

Continuously motor-driven to supply a steady high-voltage source

Bell-in-vacuum jar with a 4-6V electric bell suspended on rubber cord inside a 22 by 15cm glass chamber

Jolly's Photometer Build to Order and resonance experimentsBrightness comparing Jolly's photometer using a translucent paraffin disc method, the balanced position locating the photometric midpoint between two unequal light sources.