Word: spectras
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...make-up of the meteors was revealed by an examination of their spectra as shown in photographs of their light taken through prisms. Six of them were largely composed of stone, and all contained iron...
...Leonid meteor spectra, which the Observatory has obtained, are the first spectra of this kind ever to have been photographed. With the new photographs, the staff of the Observatory hopes to be able to study the conditions under which Leonid meteoric radiation is produced...
...plates of Leonid meteor spectra and one direct photograph of a leonid have been obtained to date from the observations made by members of the staff and students of the Harvard Observatory on the nights of Monday, Tuesday, and Thursday, November...
...Harvard owns a 60-incher. The Harvard observatories at Bloemfontein and Harvard (the town) are practically equidistant from the equator, positions which give Harvard well-nigh perfect opportunity to rake the heavens and amplify patient Dr. Annie Jump Cannon's stupendous catalog of the stars (more than 225,000 spectra already...
Cathode Ray Tube Analyzer. To understand the manufacturing possibilities of some materials, x-ray spectra are useful. Analysts get the spectra by striking the material with cathode rays until x-rays flash off. If the material can be put in a vacuum tube the process is comparatively easy. Otherwise the cathode rays must be shot out of the vacuum tube through a very thin metal window into the open air, and then upon material to be examined. This is exceedingly difficult to accomplish. Air tends to dissipate and absorb cathode rays before they can strike x-rays from anything...