268 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1910. 



I will first shoAv you an experiment, for the simplicity of which I 

 must ask your pardon ; but it illustrates so clearly how easy it really 



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is to transmit a photograph by wireless under ideal conditions. I 

 have here a small electric lamp, coupled up with the local side of a 

 relay and battery, the relay being actuated by means of a coherer de- 



