RESPONSE TO WIRELESS STIMULATION 



419 



available. The secondary terminals of a moderate sized 

 Ruhmkorft's coil were connected with two cylinders of 

 brass, each 20 cm. in length ; the sparking took place 

 between two small spheres of steel attached to the cylin- 

 ders. One of the two cylinders was earthed, and the other 

 connected with the aerial 10 meters in height. The 

 receiving aerial was also 10 meters in height and its 



""BTTTTTrtr 



i\ 



4r — — - — 



1 



[eartiM 



CA 





TT 



Fig. 153. — Diagrammatic representation of method employed for obtaining; 



response to wireless stimulation. Transmitting apparatus seen to the right. 



Receiving aerial connected to upper part of plant, the lower part of the 

 plant or the dower-pot being connected with the earth. 



lower terminal led to the laboratory, and connected by 

 means of a thin wire to the experimental plant grow- 

 ing in a pot ; this latter was put in electric connection 



