Jolly's Photometer Build to Order rated for student circuit construction

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

Used to determine irregular-object volumes by water displacement

the larger working face giving longer beam paths for measurable lateral-displacement studies

Jolly's Photometer Build to Order rated for student circuit constructionBrightness comparing Jolly's photometer using a translucent paraffin disc method, the balanced position locating the photometric midpoint between two unequal light sources.