Page:Various Forces of Matter.djvu/122

110 concerned in this case, quite different to anything we have met with before; but the force is the same. We have here then a double attraction—a dual attraction or force—one attracting and the other repelling.

Again, to show you another experiment which will help to make this clear to you. Suppose I set up this rough indicator again [the excited shellac suspended in the stirrup]; it is rough, but delicate enough for my purpose; and suppose I take this other piece of shellac, and take away the power, which I can do by drawing it gently through the hand; Fig. 34.

and suppose I take a piece of flannel (fig. 34) which