Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 21, 2025
If the sun were hollow, with the earth at its centre, the moon, though 240,000 miles from us, would have room and to spare in which to describe its orbit, for the sun is 865,000 miles in diameter, so that its volume is more than a million times that of the earth. Photographed with the spectroheliograph, using the light emitted by glowing calcium vapor.
Here lies one of the best clues for the physicist who seeks the cause of magnetism, and attempts to produce it, as Barnett has recently succeeded in doing, by rapidly whirling masses of metal in the laboratory. Sun-spot vortex in the upper hydrogen atmosphere. Photographed with the spectroheliograph. Perhaps a word of caution should be interpolated at this point.
They have succeeded in photographing the sun's surface in monochromatic light, such as the light given off as one of the bright lines of hydrogen or of calcium, by means of the "Spectroheliograph." The spectroscope is placed with its slit in the focus of an equatoreal telescope, pointed to the sun, so that the circular image of the sun falls on the slit.
"And take another quarter day of time?" Miko sneered. "Flash on your zed-ray; help him hook it up, Haljan." I moved to the lens box of the spectroheliograph. It seemed that Snap was very strangely reluctant. Was it because he knew that the Grantline camp lay concealed on the north inner wall of Tycho's giant ring? I thought so. But Snap flashed a queer look at Anita. She did not see it, but I did.
This beautiful method was first realised by Professor Hale in June, 1891. A "spectroheliograph," consisting of a spectroscopic and a photographic apparatus of special type, attached to the eye-end of an equatoreal twelve inches in aperture, was erected at Kenwood in March, 1891; and with its aid, Professor Hale entered upon original researches of high promise for the advancement of solar physics.
Finally, to mention only one more case, it was the Michelson-Morley experiment, made years ago with still another form of interferometer, that yielded the basic idea from which the theory of relativity was developed by Lorentz and Einstein. Made with the spectroheliograph, showing the immense vortices, or whirling storms like tornadoes, that centre in sun-spots.
This emanation does not go on incessantly, but only in an occasional way, as storms follow each other on the earth. What is it? Every attempt to detect it has been in vain. Professor Hale, at the Yerkes Observatory, has had in operation from time to time, for several years, his ingenious spectroheliograph, which photographs the sun by a single ray of the spectrum.
Word Of The Day
Others Looking