WITHIN the last few months « cascade arrangement of three super-valves, operated at 900,000 volts, has been constructed to emit electrons at the rate of 175,000 miles per second -the greatest speed ever developed by — human agency. .
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https://paperspast.natlib.govt.nz/periodicals/RADREC19281005.2.75
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Radio Record, Volume II, Issue 12, 5 October 1928, Page 31
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36Untitled Radio Record, Volume II, Issue 12, 5 October 1928, Page 31
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