MEASURING instruments for check ing the condition of batteries, etc., are essential where a three- or fourvalye set is employed for good quality reception, HE magnification factor of a valve is a figure based on the fact that a few volts on its grid are equal in effect to a larger number of volts upon the plate.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290913.2.48
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Radio Record, Volume III, Issue 9, 13 September 1929, Page 10
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57Untitled Radio Record, Volume III, Issue 9, 13 September 1929, Page 10
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