Smithsonian Report. 1924.— Whitney 



Plate 5 



A DEMONSTRATION OF THE TRANSMISSION 



OF Energy Through Space by Means of 

 Waves of Several Million Cycles. The 

 Lighted Lamp on the Stand Receives Its 

 Energy from the Source Located TBe- 



NEATH 



2. The Hewlett Loud Speaker. No Horn 

 Is Needed on Account of the Large Size 

 of THE Diaphragm, 26 Inches Diameter. 

 The Absence of the Horn and the Dis- 

 tributed Exciting Coil Make Reproduc- 

 tion Possible with a High Degree of 

 Faithfulness. For Its Operation, a Set 

 OF Vacuum Tubes Amplifies the Micro- 

 phone Current 



