. Electronic apparatus for biological research . (a) Figure (b) Cathode ray tube displays may also employ the 50 cycle mains as a time marker, though if an electrical time base is used the method is not much use for bases shorter than the time of one cycle—20 milliseconds. For longer bases, however, a 50 cycle sine wave is better than nothing. A difficulty with sine markers is that it is not easy to measure off from the eventual record a distance corresponding exactly to one cycle because the maxima of the wave are so ill-defined {Figure ). A much more satisfactory timer waveform is
. Electronic apparatus for biological research . (a) Figure (b) Cathode ray tube displays may also employ the 50 cycle mains as a time marker, though if an electrical time base is used the method is not much use for bases shorter than the time of one cycle—20 milliseconds. For longer bases, however, a 50 cycle sine wave is better than nothing. A difficulty with sine markers is that it is not easy to measure off from the eventual record a distance corresponding exactly to one cycle because the maxima of the wave are so ill-defined {Figure ). A much more satisfactory timer waveform is a train of 'pips' {Figure ). The author 643
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