Word: corona
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During the eclipse, especial observation was given to the corona and to the analysis of the spectrum, and the result has been that more striking and valuable photographs of those parts of the sun have been obtained than ever before. It seems almost probable that because of the important knowledge which must be gained by a close study of these photographs, the eclipse of 1889 will be looked upon, among men devoted to the study of practical astronomy, as marking an epoch in the history of solar physics. The great thirteen-inch Boyden telescope, with a lens specially corrected...
...first contact was lost through clouds. The other three were observed at a duration of 11.8 seconds. Eight negatives were secured with a thirteen inch telescope, giving images two inches in diameter; nine with an eighteenth camera. Twenty-five negatives were taken to measure the brightness of the corona and surrounding; five negatives to search for inter-Mercurial planets; twenty to study the spectrum of the corona. They will reach from yellow rays to extreme ultra violet. Seven observations were made with photometer measure. The general illumination during totality was found lighter than the eclipses...
...which has been sent out has an aperture of thirteen inches. Also there have been sent two telescopes of eight-inch aperture, besides numerous other instruments, such as photographic cameras and devices for observing the spectrum of the edge of the sun and of the different parts of the corona separately...
...corona of the sun is to be the special object of study by those who go from Harvard, for which purpose the apparatus has been so arranged as to permit the photographing of eight different regions of the spectrum of the corona at the spectrum of the corona at the same time, which will be wholly in the green and yellow parts of the spectrum. Other apparatus will take photographs of the blue region and the ultra-violet, or that which it is beyond the power of the eye to perceive. The plates will not be developed at Willows...
...been suggested that iron may be a compound of calcium and oxygen, and that these elements may be separated in the sun. So this apparatus will take the light of the very edge of the sun just as the eclipse becomes total, then of the bottom part of the corona, and then of the outer part. If it is found that some of the lines of the spectrum which appear in the photographs of the edge of the sun and the bottom of the corona, are not found in the outer part of the corona, or if some are found...