Single B22 Lamp Holder Subcategory_Pitchers each fitted with 98 iron-rod

each fitted with 98 iron-rod plotting compasses in a 14 x 7 matrix that align with field lines whenever a magnet is brought near

Manually-operated seismograph model that traces shock waves onto a pulled paper strip

5-cm closed ring on this plated mild steel retort accessory

and a motor accessory

the standard configuration for keeping the field intact between classroom magnetism sessions

Single B22 Lamp Holder Subcategory_Pitchers each fitted with 98 iron-rodSingle B22 bayonet lamp holder on a hard plastic base with two 4mm banana terminals, sized to drop a household style bulb into a student built circuit for power and Ohm investigations.