AUSTIN." HIGH SPARK FREQUENCY IN RADIO-TELEGRAPHY 7 



are always multiple, thus producing more or less regular higher 

 tones which make themselves felt in increased telephone sensi- 

 tibility; or that the short sharp jerks to which the diaphragm is 

 subjected in the case of spark discharges are more effective in 

 moving the diaphragm than sine waves. These impulses in the 

 case of 1000 sparks per second and a wave length of 1000 meters 

 with 20 waves in the train last about one-seventeenth of the length 

 of time between them if we consider that the duration of the 

 energy is not prolonged in any way in the receiving circuit. 



Regarding the second advantage of a high spark frequency, 

 namely the distribution of the energy over a large number of 

 sparks instead of concentrating it in a few, experience has amply 

 demonstrated its value. In tables II and III are given the rela- 

 tion between spark frequency, antenna energy, antenna capacity 

 and current for some commonly used spark frequencies. 



One hundred thousand volts is considered to be the maximum 

 which under any circumstances can be used to advantage on an 



TABLE II 

 Antenna Capacity per Kilowatt of Antenna Energy 



* Aruenna resistance assumed to be 6 ohms. 







