With the Hollow Cylinder small lightweight balls are suspended both on the outside and inside of a short length of metal tubing.
When the cylinder is charged through the top electrode, the balls touching the outside surface will be repelled but the balls inside will be unaffected.
Wabash Model #N-142.
Instructions for Hollow Cylinder
Forensics Lab Supply Number 3178142.
Purchase orders may be sent by email to Staff @ grauhall.com or by mail to 8524 Erinbrook Way, Sacramento, CA 95826.
All products shipped from Wabash, Indiana.