Round Stop Clock Subject_Physics Glazed porcelain mercury trough at

Glazed porcelain mercury trough at 75mm diameter with interior and exterior glazing

slotting inline with other modular demonstrator components

Reproduces Oersted's 1820 experiment

Highest-decade single-dial resistance box stepping from 100k to 1M ohms in 100k-ohm increments

Half-size digestive system model fits smaller class benches while preserving the full esophagus-to-rectum path and accessory organ anatomy in two removable parts

Round Stop Clock Subject_Physics Glazed porcelain mercury trough atStove enameled metal cased laboratory stop clock with minute and second sweep hands, a left side start stop lever, and a right side zero reset, running 24 hours on a single winding.