Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: August 7, 2024
He edged as far as he could between the wooden seat and the eyepiece of the instrument, and turned his body round so that it was chiefly his feet that were exposed. With these he could at least kick. He was still in a mystified state. The strange beast banged about in the darkness, and presently clung to the telescope, making it sway and the gear rattle.
It is evident, as in the former case, that if the surface is a true plane, the reflected image of the holes or slit thrown upon it by the telescope, b, will be seen sharply defined in the telescope, a. If any error of convexity exists in the plate, the focal plane is disturbed, and the eyepiece must be moved out. If the plate is concave, it must be moved in to obtain a sharp image.
Upon continuing to move the eyepiece inside or outside the focus we observe that the system of rings becomes larger, while the rings themselves rapidly increase in number, becoming at the same time individually thinner and fainter.
Carse could not detect any sign of the asteroid, but he remained for a little while at the eyepiece, staring at Satellite III. There it lay, a diminishing globe, three-quarters of it gleaming in the light flung by Jupiter. Dark patches mottled it: they would be the jungles. And there was the scintillant sheet that was the Great Briney Lake, with Port o' Porno nearby.
It should be remembered that a telescope, unless a terrestrial eyepiece or prism is employed, reverses such an object as the moon top for bottom. Accordingly, if the moon is on or near the meridian when the observations are made, we shall see the north polar region at the bottom and the south polar region at the top.
When the plane is not in the way, the converging beam goes back to the eyepiece, c. When the plane, d, is introduced, the beam is turned at a right angle, and if it is a perfect surface, not only does the focal plane remain exactly of the same length, but the expanded star disks, are similar on either side of the focal plane.
"These five senses of ours are pretty dull detectives sometimes," Kennedy began. "But I find that when we are able to call in outside aid we usually find that there are no more mysteries." He placed something in a test-tube in line before one of the barrels of the telescopes, near a brilliant electric light. "What do you see, Walter?" he asked, indicating an eyepiece. I looked.
He focused, using his highest-power lens combination which gave a magnification of three hundred times. The powder was clearly crystalline, a mineral of some kind. Rick couldn't identify it. He turned the eyepiece over to Dr. Miller. The scientist had no better luck. Barby asked, "Could it be an explosive?" "No, Barby. This is powdered rock of some kind," Dr.
"A piece of coal held to the wire showed faint sparks. "We had a box made thus: whereby two points could be brought together within a dark box provided with an eyepiece. The points were iron, and we found the sparks were very irregular. After testing some time two lead-pencils found more regular and very much more vivid. We then substituted the graphite points instead of iron." When Mr.
In the Ramsden eyepiece two plano-convex lenses are also used, but they are of equal focal length, are placed at a distance apart equal to two thirds of the focal length of either, and have their convex sides facing one another.
Word Of The Day
Others Looking