866 THE BELL SYSTEM TECHNICAL JOURNAL, OCTOBER 1951 



ployed to insure sharp focus all over the screen, and for the extreme care 

 with which the deflection plate system was made to avoid either "pin 

 cushion" or "barrel" distortion. Apart from the rounded corners of the 

 modulation curve, the entire system was indeed "calculable." It resulted 

 in a very long tube (about 5 feet) and an unusually complex assembly of 

 precision mechanical parts. It also resulted in an actual performance very 

 close to the predicted performance and markedly superior to that of other 

 television receiving tubes of the same period. 



References 



1. "Coaxial Cable System for Television Transmission," M. E. Strieby — Bell Sys. 



Tech. JL, Vol. 17, pp. 438-457, July 1938. 



2. K. K. Darrow's article in this issue. 



3. "Film Scanner for Use in Television Transmission Tests," A. G. Jensen — /. R. E., 



Proc, Vol. 29, pp. 243-249, May 1941. 



4. U. S. Patent No. 2,312,206, issued to C. J. Calbick. 



