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Updated: May 19, 2025
Sometimes the vein widened or developed rich lenses, and sometimes it pinched down until the walls enclosed nothing but a narrow streak of talc; but always it dipped down, and that was a good sign, a prophecy of the true fissure vein to come.
Of this he made the lens, and such was the excellence of his work that he soon became famous, to the degree that the importation of foreign telescopes virtually ceased in the United States. Nor was it long until foreign orders began to arrive for the refracting lenses of Alvan Clark & Sons.
The lawyer's eyes glimmered behind the lenses of his pince-nez; but, with the caution of the professional man he made no other sign of satisfaction. "It would do very well indeed," he replied, "but you'd have to prove they did the cutting, and you'll have to pay experts to estimate the probable amount of the timber. Have you the description of the section?"
World was busily engaged during the treatment of Miss Church- Member, but he came repeatedly to her side and spoke words of cheer and urged her strict obedience to all directions. Finally her new lenses were pub to service, and Mr. World proffered his compliments profusely until the first impulses of vanity moved within her.
Ever afterwards we suspect our instruments. We have learned that we do not see directly, but mediately, and that we have no means of correcting these colored and distorting lenses which we are, or of computing the amount of their errors. Perhaps these subject-lenses have a creative power; perhaps there are no objects.
In the attempt to overcome those difficulties, the foremost physical philosophers of the time came to the aid of the best opticians. Very early in the century, Dr. Accordingly lenses were made of diamond, of sapphire, and so on, and with some measure of success. But in 1812 a much more important innovation was introduced by Dr.
We are subject, as Bacon said, not only to "idols of the forum," but also to "idols of the den." The child, on the contrary, has not learned his own importance, his pedigree, his beauty, his social place, his religion; he has not observed himself through all these and countless other lenses of time, place, and circumstance.
Just as a trace of any gas will destroy the usefulness of your most sensitive vacuum tubes, and just as imperfect shielding will allow interfering waves to enter sensitive electrical apparatus in that same fashion will even the slightest ether vibration interfere with the operation of the extremely sensitive fields and lenses of force which must be used in controlling forces of the higher orders."
There was one place no one would think to look for him, if he could manage to keep out of range of the viewscreen lenses ... the outer hull of the ship. If he could clamp himself to the hull, somehow, and manage to cling there during blastoff, he could follow Greg and Johnny right home. He checked the fuse on the airlock once again to make certain it would work.
The former generally goes under the name of its inventor, Ramsden, and the latter is named after great Dutch astronomer, Huygens. The Huygens eyepiece consists of two plano-convex lenses whose focal lengths are in the ratio of three to one. The smaller lens is placed next to the eye.
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