A text-book on chemistry : for the use of schools and colleges . the electric spark canscarcely be confounded with any other physical phenom-enon whatever, its presence is always indubitable evi-dence of electric excitement. Thus, we can prove thatelectricity may be transferred to the human body fromthe machine, by placing a man on a ^ Fig. supported by glass pillars, If he touches the prime conductorwith one hand, sparks may be drawnfrom any part of his clothing or Otto Guericke, who was also theinventor of the air pump, we owe another of the most important discoverie
A text-book on chemistry : for the use of schools and colleges . the electric spark canscarcely be confounded with any other physical phenom-enon whatever, its presence is always indubitable evi-dence of electric excitement. Thus, we can prove thatelectricity may be transferred to the human body fromthe machine, by placing a man on a ^ Fig. supported by glass pillars, If he touches the prime conductorwith one hand, sparks may be drawnfrom any part of his clothing or Otto Guericke, who was also theinventor of the air pump, we owe another of the most important discoveries in electricity: that bodies Fig. have touched an excited substance aresubsequently repelled by it; thus, if we ruba glass tube, Fig. 7G, a, until it becomes elec-trified, and then present it to a feather, b,suspended by a silk thread to astand, c, the feather is at first at-tracted, and then immediately re-pelled. On this principle, that under certain circum-stances repulsion takes place, are founded dif-ferent methods for ascertaining the existence. Fig.
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Keywords: ., bookauthordraperjohnwilliam1811, bookcentury1800, bookdecade1840
