FIRST EXPERIMENTS 



135 



the secondary, and passed through the coherer with 

 a condenser K in series. A rather insensitive relay 



FIG. 61. Sketch of head and shoulders of a 

 lady. Transmitted by wireless. 



of the telephone service pattern was inserted in the 

 coherer -battery circuit, the battery consisting of 

 two dry cells. The local circuit of this relay 

 actuated a second relay through another battery of 



