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Updated: May 3, 2025
Later went into our carbide expenditure with Day: am glad to find it sufficient for two years, but am not making this generally known as there are few things in which economy is less studied than light if regulations allow of waste. Electrical Instruments For measuring the ordinary potential gradient we have two self-recording quadrant electrometers.
Though employing the most delicate electrometers in various ways, insulating them on a plate of glass, and receiving very strong shocks which passed through the electrometer, I could never discover any phenomenon of attraction or repulsion. The same observation was made by M. Fahlberg at Stockholm.
Dr. de la Rue concluded his interesting discourse by exhibiting some of the finest tubes of his numerous and unsurpassed collection. Engineering Coulomb's torsion balance has been adapted by M. Baille to the measurement of low electromotive forces in a very successful manner, and has been found preferable by him to the delicate electrometers of Sir W. Thomson.
On a shelf set in the bulkhead was a chart, a telephone receiver, speaking tubes, dials with red and black hands, an array of electrometers, pressure gauges. Glancing up the stairway into the little dome, Madden saw a pilot wheel, more levers and speaking tubes and telephone receivers, and a square of ground glass, that was lined off with delicate cross-lines.
Then I saw littered about his feet the shattered remains of the best of our electrometers. "What's up, man?" said I. "You've smashed the electrometer!" "Bellows again!" said he. "Friends left, if my hands are gone. Something about electrometers. Which way are you, Bellows?" He suddenly came staggering towards me. "The damned stuff cuts like butter," he said.
When the sender saw the word "attention" pass before the slit in the screen he quickly discharged the line, the balls of the two electrometers approached each other, and, if the two clocks agreed perfectly, the correspondent necessarily saw in the aperture in his screen the same word, "attention."
"Our ship is crowded with engineers, and operators, and delegates from the Governments of Russia and France, and the deck is a bewildering mass of machinery, steam-engines, cog-wheels, breaks, boilers, ropes of hemp and ropes of wire, buoys and boys, pulleys and sheaves of wood and iron, cylinders of wood and cylinders of iron, meters of all kinds, anemometers, thermometers, barometers, electrometers, steam-gauges, ships' logs from the common log to Massey's log and Friend's log, to our friend Whitehouse's electro-magnetic log, which I think will prove to be the best of all, with a modification I have suggested.
I had brought with me electrometers mounted with straw, pith-balls, and gold-leaf; also a small Leyden jar which could be charged by friction according to the method of Ingenhousz, and which served for my physiological experiments. Senor del Pozo could not contain his joy on seeing for the first time instruments which he had not made, yet which appeared to be copied from his own.
The call effected, the first operator continued to revolve the machine so that the balls of pith should diverge in the two electrometers. At the same time the two clocks were set running.
What is peculiarly interesting in Ronalds' apparatus is that it presents for the first time the use of two synchronous movements at the two stations in correspondence. It is based upon the simultaneous working of two pith-ball electrometers, combined with the synchronous running of two clock-work movements. Each of these latter contained one figure, one letter, and a conventional word.
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