Abstract
Dublin Royal Irish Academy, March 16. J. J. DOWLING and T. G. BULLEN: Precision measurements with a radial deflection oscillograph. An extra pair of concentric cylindrical electrodes are fitted between the XY deflector plates and the screen of a gas focused cathode ray oscillograph. Employing a double frequency circular time-base locked to the signal frequency a so-called Radioid curve (resembling a Limacon) is obtained, and the position of the node around the time base circle serves to measure phase or frequency differences in high-frequency circuits. Another application is as a ‘time-comparator’, and comparisons of the periods of a pair of two-seconds pendulums to within five parts in a million are easily obtained while the pendulums are executing twenty swings. An improved design of tube is described and further work promised.
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Societies and Academies. Nature 139, 1030–1031 (1937). https://doi.org/10.1038/1391030a0
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DOI: https://doi.org/10.1038/1391030a0