Large Ball-Bearing Differential Pulley, 20/30/40/60mm Steps Glass Sets & Apparatus_Organic Chemistry Sets this electrically maintained tuning fork

this electrically maintained tuning fork accepts 2-6V DC at universal binding posts

Syphon barometer at 41 inches tall with a 3

6 inches for clean pinhole-imaging and diffraction studies

providing the cleanest hand-operated way to make and break a circuit during early electricity instruction with stackable modules

each one rotating to follow the local field whenever a magnet is placed beneath the plate or alongside it

Large Ball-Bearing Differential Pulley, 20/30/40/60mm Steps Glass Sets & Apparatus_Organic Chemistry Sets this electrically maintained tuning forkFour step large ball bearing differential pulley with 20, 30, 40, and 60mm steps at 6. 5 inches overall, mounted on a 0. 75 inch post for attachment to standard rod and clamp stands.