Electrify two strips of newspaper this time and hold them together by the ends. Instantly the free ends of the papers will fly apart for like signs of electricity repel each other.

That is, since both strips of paper are positively electrified and hence are of like signs, they repel each other. If they were negatively electrified they would repel each other just the same. In either case it shows that there is a. force acting across the space between the two strips of paper.

Making Experiments With Apparatus

With a dry battery of two or three cells, an electric bell, a common steel magnet and an electromagnet, all of which you can easily make or buy 129 for a dollar or so, you can provide entertainment enough for 1/2 an hour's demonstration, and food for thought to last a year.