. Bulletin. Agriculture -- Ontario. 10 Here is another experiment. Several light pith balls, cut from the pith of an elder bush, are suspended from a little beam by silk threads. (Fig. 2.) They are free to swing about like the pendulum of a clock. Here also is a piece of caf s fur, while in this clamp is an ebonite or hard rubber rod. (Mg. 3.) A hard rubber comb would do just as well as the rod. To begin with, each one of these pith balls must be touched with the hand. The rod also must be touched from end to end with the hand. (Fig. 4.) If the rod be now placed near the pith balls we see that
. Bulletin. Agriculture -- Ontario. 10 Here is another experiment. Several light pith balls, cut from the pith of an elder bush, are suspended from a little beam by silk threads. (Fig. 2.) They are free to swing about like the pendulum of a clock. Here also is a piece of caf s fur, while in this clamp is an ebonite or hard rubber rod. (Mg. 3.) A hard rubber comb would do just as well as the rod. To begin with, each one of these pith balls must be touched with the hand. The rod also must be touched from end to end with the hand. (Fig. 4.) If the rod be now placed near the pith balls we see that it neither. Pig. 3.âCat's fur (in hand) and ebonite rod (in clamp), to be used in experiments. Fig. 4.âBefore the experiments are begun the pith-balls and ebonite rod are both touched by the hand to make them " neu- ; â / . i i : / ! ⢠^ ⢠1 1 i "r^^ - -'â â â -. asm Fig. 5.âPith-balls and ebonite neutral, no attraction between them. Fig. 6.âEbonite rubbed with cat's fur at- tracts pith-balls. Ebonite said to be electri- fied. attracts nor repels them. Both may be said to be ''; (Fig. 5.) But on rubbing the ebonite with the cat's fur and then holding it near a pith ball we see it is violently attracted to the rod. (Fig. 6.) It has been electrified by friction against the cat's fur. Placing the rod close enough that one of the pith balls can touch it, we see that immediately after contact, the ball, instead of being attracted, is strongly repelled. The ball has been electrified with part of the charge that was on the ebonite. Thus "like charges ; (Fig. 7.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ontario. Dept. of Agriculture. Toronto : The Dept.
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