Abstract
The author of this paper studied the e.ne.fs. between two metal pieces in eaintact and in relative motion, but he confined the matter of the paper to the experimental result .All the available metal pieces were tested optimal a steel dise. and found that there are some e.m.fs. characteristic to the metals in test Some of the metal' pneeluced a larger rant when the leresnure at the esontart point war greater than when it was aemaller, but mime metals slowed maximum e.m.f. with certain contact pressure. .Also the relation between the e.m.fs.and the relative velneity of the two metals at the naltaut punt was atnelied sith experimental results showed that with erase metals the e.m.fs.decreased with the relative velocity but there are some metals fur which the e.ln.fs.attained their maximum value at certain relative velocity
