OCR Text |
Show Electricity In Rubber. An ordinary India rubber band stretched and allowed to spring back by virtue of its own elasticity develops devel-ops a negative charge of electricity, which Is retained for a considerable time. The result does not appear to be influenced by the quality of the india rubber, and the same effect Is produced by a length of tube sufficiently suffi-ciently thin walled to be fairly elastic. elas-tic. An essential condition, however, is that the material be allowed to contract suddenly. If pulled out slowly slow-ly and gradually allowed to resume Its original dimensions, no electrification electrifica-tion will be produced. |