Spare Parts (Equipment / Apparatus) › ELECTRICITY KIT - THOMPSON’S RING TO FIT IRON CORE Image 1 of 1 ELECTRICITY KIT - THOMPSON’S RING TO FIT IRON CORE $3.63 Code: PA1763-270 Add To Cart Added! Code: PA1763-270 IEC Electricity Kit spare part - Thompson's ring (floats in AC magnetic field). You Might Also Like Quick View BULB (LAMP) HOLDER - SPARE FOR BKE (BEK) KITS $6.75 Quick View MOUNTED MOTOR - SPARE FOR BKE (BEK) KITS $9.75 Quick View CARBON ROD - SPARE FOR BKE (BEK) KITS $5.80 Quick View ELECTRICITY KIT MAGNETISM DEMO SPIRAL COIL $70.50 Quick View ELECTRICITY KIT CORE U/I - SET IN PLASTIC MOUNT $72.60