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Updated: June 10, 2025
This principle, employed by the boy with his cross-staff in 1564, is employed at the present day by the Astronomer Royal at Greenwich with the most superb instruments that the skill of modern opticians has been able to construct.
Although these bodies were seen they were regarded as accidental or secondary, and were not thought of as forming any serious objection to the conception of protoplasm as a definite chemical compound. But modern opticians improved their microscopes, and microscopists greatly improved their methods.
I should judge that the older of them has not been there more than a few months. They exactly correspond, so I gather that the lady went back to the same establishment for the second." "By George, it's marvellous!" cried Hopkins, in an ecstasy of admiration. "To think that I had all that evidence in my hand and never knew it! I had intended, however, to go the round of the London opticians."
Chromatic Aberration is another difficulty that opticians have to contend with in the manufacturing of lenses. It will be remembered, that in a former page a beam of light is decomposed by passing through a glass prism giving seven distinct colors red, orange, yellow, green, blue, indigo and violet.
I should judge that the older of them has not been there more than a few months. They exactly correspond, so I gather that the lady went back to the same establishment for the second." "By George, it's marvellous!" cried Hopkins, in an ecstasy of admiration. "To think that I had all that evidence in my hand and never knew it! I had intended, however, to go the round of the London opticians."
Opticians had given up, more from theory than from careful experiments, attempting high magnifying powers, even for reflecting telescopes.
The North wind swept clouds of hoar frost before it in the streets. A white steam breathed from the horses' noses, and the city folk would glance in passing at the thermometer at the opticians' doors.
A microscope magnifying 400 diameters was a chef d'oeuvre of the opticians of that day; and, at the same time, by no means trustworthy. But a magnifying power of 400 diameters, even when definition reaches the exquisite perfection of our modern achromatic lenses, hardly suffices for the mere discernment of the smallest forms of life.
"What difference does an engagement make, Abe?" he asked. "An engagement ain't a wedding, Abe, and it ain't too late even now." Again Abe indulged in a bitter laugh. "You're a regular optician, Mawruss," he said. "You never give up hope." "That's all right, Abe," Morris retorted. "We could stand a couple opticians in this concern.
Further, when a letter arrived at the Great House from Hilton and Pimm's, the opticians, with information that the equatorial was ready and packed, and that a man would be sent with it to fix it, she replied to that firm to the effect that their letter should have been addressed to Mr. St.
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