Observations on a series of electrical experiments / By Dr. Hoadly, and Mr. Wilson.

  • Benjamin Hoadly
Date:
1759
Catalogue details

Licence: Public Domain Mark

Credit: Observations on a series of electrical experiments / By Dr. Hoadly, and Mr. Wilson. Source: Wellcome Collection.

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    [ 2 7 ] 4° Let another perfon bring an excited tube near the outer furface of any part of this exhaufted tube (fuppoie near the end that is hermetically fealed, for this reafon only, that it will then be at a diftance from the hand that grafps the other end of it.) There will immediately appear lucid rays of light, very vilible when the experiment is made in the dark, proceeding from the inner furface of that part of the tube neareft the excited tube, and darting through the vacuum to the brafs, grafped by the hand. 5° And if the tubes are held ffeady for fome length of time, fo as to be kept at the fame diftance from each other; this lucid appearance will ceafe, and the light totally difappear. 6° And when the light has thus difappeared for fome time; if the excited tube be withdrawn entirely, the rays of light will appear again ; but they will now be feen darting from the brafs end of the exhaufted tube through the vacuum to the inner furface of that part of the tube, from which they had proceeded before: and this darting of the rays from the brafs end of the tube will continue for a time only, as the other had done before. 7° And when the excited tube is brought nearer, and nearer to the exhaufted one, as the light difappeared, there only appears a frefti darting of rays, ftmilar to the firft, which likewife continues for a time only: and on the removal of the excited tube, the fame kind of light, fomewhat ftronger and in greater quantity, returns from E 2 the
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