Articoli correlati a Practical Electricity, and Galvanism
Sinossi
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1807. Excerpt: ... OF THE NATURE, GENERAL LAWS AND PROPERTIES OF ELECTRICITY, SECT. I. J. HE term electricity is derived from electron, a Greek name for amber, which, when rubbed, will attract light bodies; but this term has since been extended to signify this attractive power which can be communicated, or which also resides in other bodies. We are not yet acquainted with any body in which, as is supposed, it does not reside, in a greater or in a lesser degree; but it is imperceptible in all, till properly excited: in some by friction, in others by B heating, oxidation, &c. And there are several bodies in which it cannot be made to appear but by other excited bodies. Electricity passes freely through the pores of some substances, and not at all through others: the first of these are called non-electrics, or conductors; the latter electrics, or non-conductors. Non-electrics, or conductors, are all sorts of metals, vegetable and animal matters, &c. Electrics are air, amber, glass, sealing wax, sulphur, pitch, silk, dried wood, tourmalins, &c. These bodies are easily excited so as to make electricity visible to our senses, by rubbing; but if any of them be wet, either by the dampness of the weather, or by other means, they lose that property till the wetness is removed: so that when they are to be used as non-conductors, they must be well rubbed with a dry cloth, to clear them from all moisture. ii. That quantity of electricity which seems to lie dormant in all bodies, is called their natural quantity; and this, though, doubtless, always in motion, would remain impercceptible, if not disturbed. It is roused in all electrics, and in some conductors likewise, by rubbing; in both by excited electrics approaching them; by which they gain a power of attracting and repelling light b...
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