Abstract
An attempt has been made to reproduce some results of McCusker and his coworkers who had reported diurnal effects of cosmic ray showers. The design of the apparatus follows closely that of these workers, but allows more detailed information about each recorded event to be obtained. The main categories of observed events, including those examined by McCuskeret al., show no significant diurnal variation. A possible sidereal diurnal variation of a particular group of events is critically examined, and it is concluded that, in spite of strong statistical weight, the implications of accepting the variation as physically real do not at present allow it to be regarded as such.
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