. How to make and use electricity ... Figure 5 represents two Leyden jars, one charged positivelyand the other negatively, and placed side by side on a tbem is suspended by a siik thread an image of a spi-der, having a body of elder pith and legs of black linen image is alternately attracted and repelled between the twojars, thus very strikingly showing the opposite characters ofthe two electricities. In this ingenious apparatus (Fig. 6), three little birds, made USE ELECTRICITY. 13 of pith ball or light paper, and painted to suit the taste, are keptsuspended by their
. How to make and use electricity ... Figure 5 represents two Leyden jars, one charged positivelyand the other negatively, and placed side by side on a tbem is suspended by a siik thread an image of a spi-der, having a body of elder pith and legs of black linen image is alternately attracted and repelled between the twojars, thus very strikingly showing the opposite characters ofthe two electricities. In this ingenious apparatus (Fig. 6), three little birds, made USE ELECTRICITY. 13 of pith ball or light paper, and painted to suit the taste, are keptsuspended by their mutual repulsion whilst the jar is charging;but when the charge arrives a certain degree of intensity, aspark will pass from the knob of the eun of the sportsman, andthe birds fall instantly. The sportsman should be made of tin,and the gun of copper and placed upon a small piece of The birds are attached to the wire by means of silk threads,and the two wires are inserted into the cork of a Leyden jar should not be fastened to the board. Charge the jarwith a friction machine and move its free knob up to the gun ofthe sportsman. This finishes the subject of the Leyden jar;andleads us to a short explanation of the Electrophorus, whichwe will give next time. CHAPTER III. ELECTBOPHOEUS AND CUBBENT EEECTBICITY. In case it should be impossible to make a friction ;theelectrophorus will answer all ordinary purposes. It is made inthe following manner: On a circular disk of sheet-iron or tin 8 inches in diameter ce-ment a circular disk of vulcanite 7 inches in diameter. To the center of another circular disk of tin 5 inches in diam-eter, (Fig. 1) apply with heat one end of a stick of sealing-waxfor a handle. Now strike the surface of the vulcanite a fewtimes with a cats fur or a fox-tail; it will become electrifiedwith negative (—) electricity. Then pl
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectricity, bookyear
