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

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

designed to hold visible iron-filing field lines and support side-by-side magnet-strength comparisons in mechanics labs

these two-part polypropylene Buchner funnels fit 11-12

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.