An introduction to electricity. In six sections ... : illustrated with copper plates / by James Ferguson.

  • Ferguson, James, 1710-1776.
Date:
1775
Catalogue details

Licence: Public Domain Mark

Credit: An introduction to electricity. In six sections ... : illustrated with copper plates / by James Ferguson. Source: Wellcome Collection.

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    6. When any body has more than its natural quantity of this fire or fluid, it is faid to be electrified pofi- tively, or plus; and when it has lefs than its natural quantity, it is faid to be electrified negatively, or minus.- And the machine may be made fo, as to electrify either of thefe ways. 4. * 7. When bodies are electrified either of thefe ways, they repel each other; but if fome be electrified plus, and others minus, they mutually at¬ tract: or, if one body be electrified plus, and the other no way at all, they alfo attract each other. 8. If one body, as fuppofe a piece of metal, be kept for fome time in an eletrified ftate, by means of the ma¬ chine, and an un-electrified light body, as fuppofe the down of a fea¬ ther, be brought near the metal, the feather will be attrated to the metal, and eletrified thereby: on which it B 3 will