Glass sphere having two side disc electrodes and set of mica vanes placed on a vertical spindle rotating under impact of cathodes rays. The vanes start moving in opposite direction if polarity of current is changed.
Glass sphere having two side disc electrodes and set of mica vanes placed on a vertical spindle rotating under impact of cathodes rays. The vanes start moving in opposite direction if polarity of current is changed.
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Glass sphere having two side disc electrodes and set of mica vanes placed on a vertical spindle rotating under impact of cathodes rays. The vanes start moving in opposite direction if polarity of current is changed.