Steel Ball Bearings, 3mm, 50-Pack Item Type_Mug and lead plugs for pump-plate

and lead plugs for pump-plate connection during evacuation

dimensioned to fit a pair of 75mm (3-inch) bar magnets and the keeper that bridges them while in storage

Cross wires set inside a 10mm aperture on a 75mm circular black metal screen

the lower-resistance higher-current option in the compact-tube rheostat line

this insulated wire keeps polarity color-coded across the mid-distance between instruments and student-built bench circuits

Steel Ball Bearings, 3mm, 50-Pack Item Type_Mug and lead plugs for pump-plateFifty pack of 3mm steel ball bearings, the smallest size in the series for pendulum and small scale collision experiments where a compact projectile mass is needed.