Push Button Switch Demonstrator with 4mm Terminals Item Type_Scoop Solid glass friction rod that

Solid glass friction rod that develops a positive electrostatic charge when rubbed with silk or wool

teaching electromagnetism

An 18mm pole gap on this 37 x 13 x 10mm Alnico U-shape concentrates field strongly enough to bend filings into clear field lines

used to route current down one of two alternative branches in series-parallel circuit investigations

Push Button Switch Demonstrator with 4mm Terminals Item Type_Scoop Solid glass friction rod thatMomentary contact push button switch on a base with two 4mm terminals, snapping closed only while the button is held to introduce momentary versus latched switching behavior.