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Updated: June 10, 2025
Coils of wire fixed to a rotating axis were moved past the pole of a magnet. While the coil was approaching the lines of force were increasing, and a momentary inverse current was set up, which was immediately succeeded by a momentary direct current as the coil receded from the pole. Such machines on a small scale are still to be found in opticians' shops for the purpose of giving people shocks.
I can recommend this little experiment as quite suitable for trying at home; you can buy a bit of magnesium ribbon for a trifle at the opticians; it cannot explode or do any harm, nor will you get into any trouble with the authorities provided you hold it when burning over a tray or a newspaper, so as to prevent the white ashes from falling on the carpet.
The following considerations may serve to remove certain untoward difficulties in metaphysics and optics, which beset the path, not only of the uninitiated, but even of the professors of these sciences. We are assured by optical metaphysicians, or metaphysical opticians, that, in the operations of vision, we never get beyond the eye itself, or the representations that are depicted therein.
Even at this day I do not know that any other observatory can show a circle eight feet in diameter graduated all round. I think it is Professor Piazzi Smith who tells us how grateful he was to find a large telescope he had ordered finished by the opticians on the very day they had promised it. The day was perfectly correct; it was only the year that was wrong.
As her glasses are of remarkable strength, and as opticians are not very numerous, there should be no difficulty in tracing her." Holmes smiled at the astonishment of Hopkins, which must have been reflected upon my features. "Surely my deductions are simplicity itself," said he.
"Among opticians and astronomers," he writes to Lina, "nothing now is talked of but WHAT THEY CALL my great discoveries. Alas! this shows how far they are behind, when such trifles as I have seen and done are called GREAT. Let me but get at it again! I will make such telescopes and see such things!"
Desirous of obtaining the same gratification for their friends, they endeavoured to learn the name of the inn at which he lodged; but Sirturi fortunately overheard their inquiries, and quitted Venice early next morning, in order to avoid a second visitation of this new school of philosophers. The opticians speedily availed themselves of the new instrument.
Opticians tell us that the mental combination of the views of an object which we obtain from stations no further apart than our two eyes is sufficient to produce in our minds an impression of the solidity of the object seen; and we find that this impression is produced even when we are aware that we are really looking at two flat pictures placed in a stereoscope.
The worst of the class, oddly enough, are those found in front of watchmakers' and opticians' shops. I sometimes think that such clocks are purposely put out of order by the shop-keeper. The object is apparently to induce irascible old gentlemen to enter the store, watch in hand, in order to protest against the maintenance of a public nuisance.
"No use to speak to the governor; he don't use blinkers; and so won't have no fellow-feeling." Newton entered into conversation, and found that an old man, who gained his livelihood in a small shop close to the gate, by repairing the spectacles of the pensioners, had lately died, and that his loss was severely felt by them, as the opticians in town did not work at so reasonable a rate.
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