The telephone is of no use as a “far-speaker,” without some means of calling the attention of the attendant at the distant station. Nothing could well be better than the “electric-bell call,” and the sounder which I am about to describe makes no pretensions of competing with the bell, except on the points of simplicity, cheapness, and facility of use; and although its employment is limited to short length lines, it may be assumed that it is upon short length lines that the telephone will be most frequently used. I have had this sounder in experimental use for more than three months, and have shown it to many persons as a very obvious expedient. However, as it does not appear to have been referred in any publication, I venture to bring it as a Note before the Society; it is of too trifling a nature to be made the subject of a formal paper.