500 Austin; eesonance MEAsuREME^?TS 



use of the well-known relation existing between the product of 

 inductance and capacity and the wave length. 



Besides the simplicity and quickness of this method, it has the 

 advantage that it does away with the necessity for all auxiliary 

 apparatus in the wave meter, and enables measurements of the 

 highest accuracy to be taken on shipboard and in other places 

 where the use of sensitive galvanometers is impossible. 



