Transmitting Antenna in Wireless Telegraphy. 13 



that at the free end. This is due, without doubt, to the fact 

 that the antenna and transformer secondary together compose a 

 single conductor, and the fundamental oscillation would have 

 a potential loop at each end. But the chief minimum shows a 

 rather remarkable variation. As the length of the antenna 



is increased the distance of the minimum from the free end 

 increases until it reaches its greatest value with a wire 500 cms long, 

 and then it decreases. The reason for this is not very evident, 

 but it seems that in this disposition the reaction of the secondary 

 of the transformer upon the primary varies with the length 

 of the antenna joined to it, thus altering its frequency, the 

 greatest change being when the wire is 500 cms long. With 

 antenna of this length the readings were the highest of the 



