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Thus a feather electrified by an excited glass rod, will be repelled by the latter, but will be attracted by an excited stick of sealing wax: and, electrified by an excited stick of sealing wax, it will be repelled by the latter, but will be attracted by the excited glass rod. 27 These different species of electrical excitement are always co-existent: that is, we cannot produce the one without its being accompanied also, by the other. For the feather repelled by the glass tube, or the sealing wax [26], will be attracted by the silk or the flannel which has been used to effect the electrical excitation. 28 Vhen the electricities are of low intensity, it would appear that some bodies, capable of transmitting one of them, are imperfect, or even non-conductors of the other. 29 Positive electricity or that of the excited glass rod, leaves the point of a wire in the form of a pencil or brush : negative or that of the excited sealing wax, in the form of a star. prev next |