The first radio valve, which was invented in 1904 by Professor lleming, an Englishman, possessed only a filament and a plate. This was improved upon by Dr. Lee De Forest, an Ameriean, in 1907, who added the grid to the valve. This improved valve has tfemained to this day in practically its original form.
Permanent link to this item
https://paperspast.natlib.govt.nz/periodicals/RADREC19271209.2.13
Bibliographic details
Radio Record, Volume I, Issue 21, 9 December 1927, Page 3
Word Count
54Untitled Radio Record, Volume I, Issue 21, 9 December 1927, Page 3
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