A HIGH POWER VACUUM TUBE 



13 



tension insulation could be more easily provided and a larger tube 

 was, therefore, designed capable of delivering 10 k. w. to an antenna 

 at a plate voltage of 10,000 volts. 



The final form adopted for this tube is shown in Figs. 8 and 9. 



Fig. 8 



The anode A is drawn from a piece of sheet copper and is 9" long 

 and 2" in diameter. The copper flare B is turned down to a sharp 

 edge and a glass bulb C sealed thereto. The grid and plate assembly 

 is shown at D. The structure is supported by four molybdenum 

 rods, which are threaded and secured by means of nuts to the lavite 

 pieces E and F. The filament is made of 19.5" of .025 pure tungsten 

 wire purchased from the General Electric Company and is formed 

 and secured to two of the molybdenum rods at G and H. The 



