PRODUCTION OF TELEVISION SIGNALS 



571 



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Fig. 10 — Detailed structure of the grid. The exterior electrodes are pieces of 

 metal foil cemented to the outside of the tube. The interior electrode is a long 

 spiral of wire. 



Fig. 11 — Distributor and wiring. High frequency current is distributed by 2500 

 wires to successive electrodes of the grid from 2500 bars on a high speed dis- 

 tributor. 



