One-Meter Two-Wire Potentiometer Subcategory_Electromagnetism Four 153 x 76mm plates

Four 153 x 76mm plates - each holding 98 iron-rod plotting compasses in a 14 x 7 matrix - assemble flat or as the faces of a cube to display 2D and 3D field-line patterns

Five filament bulbs rated 12V/20W

Alnico Grade III bar pair at 75 x 15mm with steel keepers in a cardboard box

and gas control on natural gas for high-temperature chemistry heating applications

One-Meter Two-Wire Potentiometer Subcategory_Electromagnetism Four 153 x 76mm platesTwo wire one meter potentiometer on a polished hardwood baseboard, providing the higher precision twin track variant for EMF comparison and internal resistance measurement by null deflection.