Force Pump Demonstration Apparatus Glassware_Glass Bottles retaining magnetic strength through repeated

retaining magnetic strength through repeated handling and storage cycles

Plastic MES bulb holder with mounting tabs and screw terminals

Tangent-galvanometer instrument that derives current absolutely from compass-needle deflection against Earth's horizontal field

this insulated lead pairs a 4mm banana plug at one end with a crocodile clip at the other for flexible patch wiring

5-inch height for free-spinning compass and magnetometer demonstrations

Force Pump Demonstration Apparatus Glassware_Glass Bottles retaining magnetic strength through repeatedBorosilicate glass force pump model with transparent walls revealing the valve and piston action, demonstrating how positive displacement drives fluid against gravity.