| Fig. 109. | Fig. 110. |
243. Fancy Electroscope. Fig. 111. Fold a piece of stiff paper double, then cut out some fancy-shaped figure, as suggested, and draw the face, clothes, etc., to suit. This being folded through the center for cutting, it can be balanced upon a pin-point as explained in [App. 138].
| Fig. 111. | Fig. 112. |
244. Box-Cover Electroscope. Fig. 112. A pasteboard box-cover, balanced upon a pin, makes a fairly good electroscope, although it is not nearly so sensitive as [App. 138]. The pin may be stuck in the upper end of the dowel, D, shown in Fig. 108.
245. Leaf Electroscope. Fig. 113. This is a very sensitive instrument, and can be used to tell the kind of static electricity on a body, as well as the mere presence of it. (See experiments in text-book.) The lamp chimney acts as a support for the leaves, L, and it protects them from currents of air. A tin box-cover, C, has a small hole punched through its center. Through this is pushed one end of a wire, W. This may be a hairpin, straightened. The upper end is bent over at right angles, after passing it through the hole. The lower end is bent as shown. On this horizontal part is fastened the leaf. These should be made of aluminum leaf, or of Dutch metal. The former will stand more rough handling than the latter. Goldleaf is used for very sensitive instruments. It is a little too delicate for unskilled hands.
| Fig. 113. | Fig. 114. |