US$ 56.99
and resonance experiments
letting students drive the lamp directly or send the slow AC output to a meter or oscilloscope
Solid glass friction rod that develops a positive electrostatic charge when rubbed with silk or wool
rated for student circuit construction and series-parallel investigations where junction-voltage and current-limiting concepts get introduced
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.