'5 



and get the molecules into a state of still greater friction one 

 with th. ..the r. Remembering that the conductivity of Iron 

 is 20*18 and ZA 5*5, and that the larger the Iron surface- 



friction a the greater the E.M.F. we might 



expect to create, let us construct an clement I # x Ji x # 

 as the last and with the same materials. Let us insert, 

 ht, into the ZA a number of pieces of this Iron wire 

 gauze, alternately I and i $6 inches long, connected to the 

 bottom I ron (Fig. 15). Heat up as before. We look anxiously 





