Platinum Electrode for Electrolyzer, 14 x 2.5 x 0.8mm Subcategory_Dissection Equipment Millimeter-graduated 15cm Hooke's-Law scale on

Millimeter-graduated 15cm Hooke's-Law scale on a 30cm support rod

six locking sliding bases on 6mm rods

Two pith balls suspended on unspun silk from a brass pillar

Painted red and blue along their lengths to mark north and south poles

each one rotating to follow the local field whenever a magnet is placed beneath the plate or alongside it

Platinum Electrode for Electrolyzer, 14 x 2.5 x 0.8mm Subcategory_Dissection Equipment Millimeter-graduated 15cm Hooke's-Law scale onPlatinum anode and cathode pair fitted in a rubber bung, providing the gold standard inert electrode pair for electrolysis experiments where electrode degradation must be eliminated.