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Updated: May 16, 2025
Being sufficiently habituated to the climate not to fear the effect of tropical rains, we remained on the shore to observe the electrometer. I held it more than twenty minutes in my hand, six feet above the ground, and observed that in general the pith-balls separated only a few seconds before the lightning was seen. The separation was four lines.
Faint coruscations of the Aurora Borealis appeared one evening but their presence did not in the least affect the electrometer or the compass.
"Don't talk nonsense. You're very much alive. You are in the laboratory, blundering about. You've just smashed a new electrometer. I don't envy you when Boyce arrives." He stared away from me towards the diagrams of cryohydrates. "I must be deaf," said he. "They've fired a gun, for there goes the puff of smoke, and I never heard a sound."
Body and soul are alive to all the enticements of the world of sense; and in certain critical moments, the entire sensorium, upon the approach of bold and powerful excitements, flutters and trembles like an electrometer in a thunder-storm. All passionate poetry breathes of youth and spring.
The tap is then closed, the mercury ascends again, and this action keeps on repeating. Herr S. Kalischer has renewed his investigations upon this point, and believes that he has proved that no electricity results from such condensation. Atmospheric vapor was condensed upon a vessel coated with tin foil, filled with ice, carefully insulated, and connected with a very sensitive electrometer.
His divided-ring electrometer admitted of accurate measurements, in skilled hands, of fractions of a Daniell's cell; his portable electrometer admits of readings from 10 or 20 cells upwards; but his new reflecting electrometer gives as much as 100 divisions on the scale for one single cell of the battery. In Mr.
The most delicate electrometer is no way affected in whatever manner it is employed, whether bringing it near the organs or insulating the fish, covering it with a metallic plate, and causing the plate to communicate by a conducting wire with the condenser of Volta.
We saw flashes of heat-lightning to the south; and the electrometer of Volta constantly displayed, at sunset, positive electricity. The pith balls, unexcited during the day, separated to the width of three or four lines at the commencement of the night, which is triple what I generally observed in Europe, with the same instrument, in calm weather.
On putting an electric machine in communication with such or such a one of these wires, the ball of the corresponding electrometer was repelled, and the motion signaled the letter that it was desired to transmit. Not content with having realized an electric telegraph upon a small scale, Lesage thought of applying it to longer distances.
There was the Thomson reflecting mirror galvanometer and electrometer, while nearby were the standard cells by which the galvanometers were adjusted and standardized.
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