Abstract
ONE of the common principles of contact electrification is that considerable electrification accompanies the relative motion of two surfaces only if one or both of them has a low electrical conductivity. Dealing with the electrification which occurs when a powder or sand flows down an inclined earthed metal surface, Hudson1 has shown, by an indirect method, that a typical insulator (zircon sand) acquires a much larger charge than a semiconductor (rutile sand). Hudson's findings were confirmed by measuring directly the charge acquired by these sands from various lengths of an earthed aluminium chute. Fig. 1 shows the results for sands of 114µ average particle size.
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