By permission of Marconi's Wireless Telegraph Co., Ltd. 



CARNARVON MARCONI WIRELESS STATION THE LARGEST VALVE PANEL IN THE 



WORLD 



We see here a number of Thermionic Valves connected up together. Such an arrange- 

 ment is enormously more sensitive than any single valve. Transmission over very great 

 distances is only possible through the employment of series of thermionic valves acting as 8 

 detector of extreme sensitiveness. 



Since the above photograph was taken eight more valves have been added, making 

 fifty-six in all. 



From ''Useful Notes on Wireless Telegraphy," Book V (The 

 Wireless Press, Ltd.). 



AMPLITUDE OF BEAT CURRENT 



The two vibrations A and B, which differ slightly from one 

 another, unite to produce the vibration C, which, as we see 

 from the diagram, is much less regular than the two component 

 vibrations, and has maximum points which are distinctly 

 greater than the amplitudes of either of the constituent 

 vibrations. 



