9 



and breaking of the electric current, and of its continuous 

 flow. 



B. Induced or Faradic Current. Lead off wires from the 

 screw-terminals F on the table to the screws on the top of the 

 end of the primary coil of an induction coil (fig. 2), and intro- 

 duce a mercury key into the circuit. Lead wires from the 



Induction Coil 

 FIG. 2. Induced Current. 



terminals of the secondary coil to a friction key, so that when 

 it is closed the current is short-circuited. Lead off two ter- 

 minal wires from this key. Pull the secondary coil well away 

 from the primary, open the friction key, so that the current 

 may pass to the wires, and use the wires as in the last ex- 

 periment. Note the effect on the tongue of the sudden 

 appearance and disappearance of the current induced in the 

 secondary coil each time the primary circuit is made or 

 broken. 



RESULTS. 



