Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: June 7, 2025
Any of the various fluorescing substances placed in the focus of the object-glass, or at the optical image in front of the eyepiece, will show the picture in the color peculiar to the fluorescing material. The color does not matter." "More simple still," laughed the admiral. "But how about the colored lights they saw?" "Simply the discarded light of the spectrum.
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.
I looked at the faces before me, now tensely watching Kennedy, forgetful of the wire-like strings which they held in their hands. I studied Teresa de Leon intently for a while. She was still the enigma which she had been the first time I saw her. Kennedy paused long enough to look through the eyepiece again as if to reassure himself finally that he was right.
Quickly I thrust the youth from the eyepiece, and, as calmly as I could, said: "I thought I heard propellers." Half an hour later we surfaced for the night. I have been wondering ever since whether they suspect, for the three of them were talking in the wardroom after dinner and stopped suddenly when I came in. I must be careful in future.
He took the telescope from its padded case, and screwed its base to the tripod, then he adjusted the tripod until it was standing securely. "Watch this," he commanded. "You'll have to do it, because you can't carry the whole thing assembled." Using the rings, which were adapters, he fitted the camera to the eyepiece of the telescope. "That's all there is to it.
Suppose we turn it in such a way that the eyepiece moves slightly outside the focus, or away from the object glass. Very beautiful phenomena immediately begin to make their appearance. A slight motion outward causes the little disk to expand perceptibly, and just as this expansion commences, a bright-red point appears at the precise center of the disk.
"This microscope shows me," he said, "that the voices on that cylinder you heard are identical with two on this record which I have just made in this room." "Walter," he said, motioning to me, "look." I glanced into the eyepiece and saw a series of lines and curves, peculiar waves lapping together and making an appearance in some spots almost like tooth marks.
Staggering weakly, he made his way to the observatory, mounted the steps with tired limbs, and wobbled to the eyepiece of his telescope which he had left focused on the dark star two hours before. Almost trembling, he peered through it. The dark star was gone.
Now if we push the eyepiece toward the mirror the same distance on the opposite side of the true focal plane, precisely the same appearance will be noted in the expanded star disk. If we now place our plane surface any where in the path of the rays from the great mirror, we should have identically the same phenomena repeated.
It cast a circular glow downward. Under it I saw a low platform raised a foot or two above the ground. A giant electro-microscope was hung with its twenty foot cylinder above the platform. Its intensification tubes were glowing in a dim phosphorescent row on a nearby bracket. A man sat in a chair on the platform at the microscope's eyepiece.
Word Of The Day
Others Looking