Proceedings, American Philosophical Society (vol. 96, no. 3)American Philosophical Society |
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a-rhythm active electrode after-potentials Airport appears Ballston Spa Belt Cave Benjamin Franklin's experiments blades bones brain bright object Caspian Champlain Bridge clouds Collinson conductor cortical object course curves Dalibard dark object deflection direction elec electrical fluid electrified electromotive forces electrotonic action End Scrapers erected experimental exposure fact fixation mark flake flew flock flow flown fluorine followed Fort Monmouth Fourth Gravels fovea Franklin Franklin's experiments ref French Gravels grounded electrode head homing pigeons HOTU CAVE indicate insulated rod Jernegan June kite experiment landmarks letter lightning rods loft July McAdie median plane ment Mesolithic Middlebury miles minutes movement moving object Neolithic nerve impulses object moves observations orientation flight periments Philadelphia pigeons Pleistocene position potential present Priestley Priestley's records Red Gravel region release point responses Romas scrapers sentry-box experiment Sialk skeletons skull sparks supra taken thunder tion Upper Palaeolithic visual cortex visual currents Wurtsboro
Beliebte Passagen
Seite 337 - To determine the question, whether the clouds that contain lightning are electrified or not, I would propose an experiment to be tried where it may be done conveniently.
Seite 333 - As soon as any of the thunderclouds come over the kite, the pointed wire will draw the electric fire from them, and the kite, with all the twine, will be...
Seite 347 - If any danger to the man should be apprehended (though I think there would be none), let him stand on the floor of his box, and now and then bring near to the rod the loop of a wire that has one end fastened to the leads, he holding it by a wax handle; so the sparks, if the rod is electrified, will strike from the rod to the wire, and not affect him.
Seite 358 - I thought it right he should be informed of our success in using it, and wrote him several letters containing accounts of our experiments. He got them read in the Royal Society, where they were not at first thought worth so much notice as to be printed in their Transactions. One paper, which I wrote for Mr. Kinnersley, on the sameness of lightning with electricity, I sent to Dr.
Seite 333 - And when the rain has wet the kite and twine so that it can conduct the electric fire freely, you will find it stream out plentifully from the key on the approach of your knuckle.
Seite 346 - ... of those edifices, upright rods of iron made sharp as a needle, and gilt to prevent rusting, and from the foot of those rods a wire down the outside of the building into the ground, or down round one of the shrouds of...
Seite 336 - ... he observed some loose threads of the hempen string to stand erect, and to avoid one another, just as if they had been suspended on a common conductor. Struck with this promising appearance, he immediately presented his knuckle to the key, and (let the reader judge of the exquisite pleasure he must have felt at that moment) the discovery was complete. He perceived a very evident electric spark. Others succeeded, even before the string was wet, so as to put the matter past all dispute ; and when...
Seite 336 - The kite being raised, a considerable time elapsed before there was any appearance of its being electrified. One very promising cloud had passed over it without any effect; when, at length, just as he was beginning to despair of his contrivance, he observed some loose threads of the hempen string to stand erect, and to avoid one another, just as if they had been suspended on a common conductor.
Seite 353 - In every stroke of lightning, I am of opinion that the stream of the electric fluid, moving to restore the equilibrium between the cloud and the earth, does always previously find its passage, and mark out, as I may say, its own course, taking in its way all the conductors it can find, such as metals, damp walls, moist wood, &c. and will go considerably out of a direct course, for the sake of the assistance of good conductors; and that, in this course, it is actually moving...
Seite 348 - Rod may be secured to the House by a few small Staples. If the House or Barn be long, there may be a Rod and Point at each End, and a middling Wire along the Ridge from one to the other. A House thus furnished will not be damaged by Lightning, it being attracted by the Points, and passing thro' the Metal into the Ground without hurting any Thing.