. How to make and use electricity ... the cork of a soda-water bottle-pass a stout brass semi-circular wire. Cast on each of its ends a lead bullet. Place thecork in the bottle, and use it as a handle. When it is desirableto discharge thy Leyden jar touch the outer coating with oneball and the knob of the jar with the other. A bright sparkwill pass from the knob to the ball and the jar will discharge it-self with a loud report. The charge of a Leyden jar maybe retained for a very longtime. If the surfaces be well separated from each other thecharge remains for many days, or even weeks. The cha
. How to make and use electricity ... the cork of a soda-water bottle-pass a stout brass semi-circular wire. Cast on each of its ends a lead bullet. Place thecork in the bottle, and use it as a handle. When it is desirableto discharge thy Leyden jar touch the outer coating with oneball and the knob of the jar with the other. A bright sparkwill pass from the knob to the ball and the jar will discharge it-self with a loud report. The charge of a Leyden jar maybe retained for a very longtime. If the surfaces be well separated from each other thecharge remains for many days, or even weeks. The charge isusually dissipated by particles of dust in motion or other con-ducting substances in the atmosphere from one of the coatings 12 HOW TO MAKE AND to the other, or by the uncoated interval becoming moist andlosing its insulating power; consequently a jar will retain itscharge longer in dry than in damp weatner. It is best tomake three or four Leyden jars, since there are some experi-ments which require the exclusive use of a 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 board.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectricity, bookyear
