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The noise seemed to come from the bottom of the well; a very curious phenomenon, though very common in most of the countries of America which are exposed to earthquakes. A few minutes before the first shock there was a very violent blast of wind, followed by electrical rain falling in great drops. I immediately tried the atmospherical electricity by the electrometer of Volta.
In the Memoirs of the Roman Academy of Sciences for 1857 he published a description of his new divided ring electrometer, which is based on the old electroscope of Bohnenberger and since then he has introduced a chain or series of beautiful and effective instruments, including the quadrant electrometer, which cover the entire field of electrostatic measurement.
The spectroscopic reaction which we may use in the course of this separation is a thousand times less sensitive than observation of the activity by means of the electrometer. Though the principle on which the operation of the concentration of the radium rests is admirable in its simplicity, its application is nevertheless very laborious.
He repeats the difficult ones of M. VOLTA, and clearly demonstrates the electrical phenomena presented by the metallic pile. A hundred disks of silver and a hundred pieces of zinc are sufficient for him to produce attractions, sparks, the divergency of the electrometer, and electric hail. He charges a hundred Leyden bottles by the simple contact of the metallic pile.
We might even place a layer of asphalte between the copper floor and the ground, so as to insulate the building. If the mill were then struck with lightning, it would remain charged for some time, and a person standing on the ground outside and touching the wall might receive a shock, but no electrical effect would be perceived inside, even on the most delicate electrometer.
Faint coruscations of the Aurora Borealis appeared one evening, but their presence did not in the least affect the electrometer or the compass.
In every motion, her most innocent soul outbeams so brightly, that who saw would say, "Guilt was a thing impossible in her." Her information various. Her eye watchful in minutest observation of nature; and her taste, a perfect electrometer. It bends, protrudes, and draws in, at subtlest beauties, and most recondite faults. She and W. desire their kindest respects to you.
He took up an electrometer, a hydrometer, a compass, a thermometer, and a Toricelli barometer, together with bottles of water, in order to collect samples of the air at different heights. In 1785 he made a second ascent, when trigonometrical observations of the height of the balloon were made from the French coast, giving an altitude of 4,800 feet.
Charge the prime conductor of an electrical machine, and a gold-leaf electrometer, far off from it, will at once be disturbed. Electricity, as we all know, can be stored and transported as if it were a measurable fluid. "Your incident is a typical example of cerebral induction from a source containing stored cerebricity.
The instrument is in its present form so practically useful that it has been largely used in connection with telegraphic cables, and Mr. Varley has calculated tables to enable any electrician at a glance to infer from two readings by this electrometer the insulating power of any telegraphic cable. Sir William Thomson is no specialist.
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