. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- 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 {F
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press
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