The "'1st element "'( from left to right ) is ( for receiving tubes ) a number specifying filament voltage in volts ( rounded to the nearest whole number ), or ( for cathode-ray tubes ) the screen diagonal or diameter in centimeters ( rounded to the nearest whole number ).
12.
At this time, however, he was also experimenting with an improved cathode ray receiving tube, filing a patent application for this in November 1929, and introducing the new receiver that he named the " kinescope ", reading a paper two days later at a convention of the Institute of Radio Engineers.
