10cm Support Ring with Integrated Boss Head, up to 5/8" Rods Glassware_Glass Flasks sized to keep electromagnetism demonstrations

sized to keep electromagnetism demonstrations running when the original coils wear out

and equilibrium experiments

Higher-range 30-0-30mA center-zero galvanometer at 20mA sensitivity and plus-or-minus 2

supporting 18 mm thermometers upright and protected between laboratory uses

Sliding-top wooden box 5 x 2 x 1 inches with a recess sized for a pair of 100mm (4-inch) bar magnets plus their keeper

10cm Support Ring with Integrated Boss Head, up to 5/8" Rods Glassware_Glass Flasks sized to keep electromagnetism demonstrationsIntegrated boss head pairs with a 10 cm plated mild steel closed support ring, accepting vertical rods up to 5 8 inch to secure funnels and flasks above heat sources.