Photo-Electricity: the Liberation of Electrons By Light, With Chapters On ...
Photo-Electricity: the Liberation of Electrons By Light, With Chapters On ...
Herbert Stanley Allen
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I. Is Light the Active Agent in producing Fatigue? — ^We have seen that in the early literature of the subject fatigue was often attributed to the direct action of the Ught. L Digitized by Google l62 PHOTO-ELECTRICITY Kreusler,* who was the first to investigate fatigue effects systematically, expressly states that the fatigue depends on an action of the ultra-violet light on the surface of the kathode. This is shown by the following experiment. The photo- electric current with a potential of 33...20 volts was measured several times in succession, using a kathode of freshly-poUshed zinc. Between two measurements the kathode remained in connection with the earth — that is, at zero potential. During this interval it was either illuminated for several minutes or shielded from the Ught (a 2 mm. spark between Al terminals). The following table illustrates the results : Initial .... After 8 minutes in darkness After 5 minutes in light . After 6 minutes in darkness After 5 minutes in light .
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