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<p>The author had previously observed that a copper sulphate cell with very unequalsized copper electrodes showed an apparent rectifying effect for alternating currents of the frequency of telephonic currents. Further experiments are here described. The electrodes are made from the same No. 30 wire, the small one being from 1 to 40 mm. long and the larger 1 to 30 cm. long. The sensitiveness under these conditions appears to be almost independent of the size of the smaller electrode. The relation between the direct current produced and the alternating p.d. applied is shown by a curve. The lowest voltage observed when direct connected is about 1/10000 volt, but the sensitiveness is limited by the
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<br>Subjects: alternating-current research; oscillations and waves (electric); Electrical instruments and techniques</div>
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