• Fluctuating B field causes ring to either 1) jump off of apparatus, or 2) levitate. 
• For new apparatus (right in top picture): plug into wall and push the switch on the right down to let current flow. For old apparatus (left in top picture): plug Apparatus into variac; turn variac knob to set current amount; flip variac switch to “on” position to produce instantaneous B field.
• For added excitement, cool rings with LN2 to increase conductivity.

Notes about use

• For old apparatus: apparatus is pretty old. Iron rods not securely connected to wooden base. Hold onto base and rods, when lifting or transporting.
• Do not touch apparatus when current is flowing (variac on or switch pressed).

• Jumping ring apparatus located in L01, section B2. Variac
  located in L01, section A1.