Jolly's Photometer Build to Order Used to determine irregular-object volumes

Used to determine irregular-object volumes by water displacement

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

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

Jolly's Photometer Build to Order Used to determine irregular-object volumesBrightness comparing Jolly's photometer using a translucent paraffin disc method, the balanced position locating the photometric midpoint between two unequal light sources.