4" Cast Iron Closed Ring Support Type_Celestial Hand-cranked simple motor model on

Hand-cranked simple motor model on a 5

sized for demonstrating the inverse pressure-volume relationship of a gas at constant temperature

designed for classroom identification drills and examination preparation

One-meter single-wire potentiometer with 24 SWG constantan wire stretched along a millimeter scale

sized for repeated student use on solid-core and stranded wire ahead of crocodile-clip and terminal-block work

4" Cast Iron Closed Ring Support Type_Celestial Hand-cranked simple motor model onRugged cast iron closed support ring with an integral screw clamp, combining a 4 inch inner diameter and a rod grip from 5 16 to 5 8 inch for holding wire gauze and vessels over heat.