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65 (p. 63 Continued) Because the atmospheres of the prime conductor is pressed by the atmosphere of the exited tube, and [[strikethrough]]driven[[/strikethrough]] driven towards the end where the threads are, by which each thread acquires more atmosphere. [[underline]]Withdraw the tube, and they will close as much.[[/underline]] ___They close as much, and no more, because the atmosphere of the glass tube, not having mixed with the atmosphere of the prime conductor, is withdrawn entire, having made no addition to, or diminution from, it. [[right margin of first paragraph]] A seeming Cause of the Tides [[/right margin of first paragraph]] [[underline]]Bring the excited tube under the tuft of threads, and they will close a little.[[/underline]] ___They close, because the atmosphere of the glass tube repels their atmospheres, and drives part of them back on the prime conductor. [[right margin of second paragraph]] Experiments upon weighing Air. [[/right margin of second paragraph]] [[underline]]Withdraw it, and they will diverge as much.[[/underline]] ___ For the portion of atmosphere, which they had lost, returns to them again. Experiment II. [[underline]]Excite the glass tube, and approach the prime conductor with it, holding it across near the opposite end, to that on which the threads hang, at the distance of 5 or 6 inches. Keep it there a few [[strikethrough]]minutes[[/strikethrough]] seconds, and the threads of the tassels will diverge. Withdraw it, and they will close.[[/underline]] ___They diverge, because they have received electric atmospheres from the electric matter before contained in the substance of the prime conductor; but which is now repelled and driven away by the atmosphere of the glass tube, from the parts of the prime conductor, opposite and nearest to that atmosphere, and forced out upon the surface of the prime conductor at its other end, and upon the threads hanging thereto. Were it any part of the atmosphere of the glass tube, that flowed over and along the prime conductor to the threads, and gave them atmospheres (as in the case when a spark is given to the prime conductor, from the glass tube) such part of the tube's atmosphere would have remained, and the threads continue to diverge; but they close on withdrawing the tube, because the tube takes with it [[underline]]all its own Atmosphere[[/underline]], and the electric matter, which had been driven out of the substance of the prime conductor, and formed atmospheres round the threads, is thereby permitted to return to its place. [[underline]] Take a spark from the prime conductor, near the threads, when they are diverged as before, and they will close. [[/underline]] ___For by so doing you take away their atmospheres, composed of the electric matter driven out of the substance of the prime conductor, as aforesaid, by the repelling of the atmosphere of the glass tube. By taking this spark you rob the prime conductor of part of its natural quantity of the electric matter; which part so taken is not supplied by the glass tube, for when that is afterwards withdrawn, it takes with it its whole atmosphere, and leaves the prime conductor electrised negatively, as appears by the next operation. [[underline]] Then withdraw the tube, and they will open again. [[/underline]] For now the electric matter in the prime conductor, returning its equilibrium, or equal diffusion, in all parts of of its substance, and the prime conductor having lost some of its natural quantity, the threads connected with it lose part of theirs, and so are electrised negatively, and therefore repel each other, by [[underline]] Princ. [[/underline]] ^le^ III. [[underline]] Approach the prime conductor with the tube near the same place as at first, and they will close again. [[/underline]] Because the part of their natural quantity of electric fluid, which they had lost, is now restored to them again, by the repulsion of the glass tube forcing that fluid to them from other parts of the prime conductor; so they are now again in their natural state. [[underline]] Withdraw it and they will open again. [[/underline]] For what had been restored to them is now taken from them again, flowing back into the prime conductor, and leaving them once more electrised negatively. [[underline]] Bring the excited tube under the threads, and they will diverge more. [[/underline]] ___Because more of their natural quantity is driven from them into the prime conductor, and thereby their negative electricity increased. Experiment III. [[underline]] The prime conductor not being electrised, being the excited tube under the tassel, and the threads will diverge. [[/underline]] ___Part of their natural quantity is thereby driven out of them into the prime conductor, and they become negatively electrised, and therefore repel each other. [[underline]] Keep the tube in the same place with one hand, attempt to touch the threads with the finger of the other hand, and they will recede from the finger. [[/underline]] (Continued on p. 67) Because [[end of page]]
Transcription Notes:
The spelling of a double "s" as "fs" is correct for this period. The "f", known as a tall "s", symbolizes a soft "s" sound. Please do not correct.
- Note by editor: it is not an f; simply a "long s". This is essentially a different way of writing an "s", and is not an "f". Corrections made accordingly.