The Observatory, כרך 14

כריכה קדמית
Editors of the Observatory, 1891
"A review of astronomy" (varies).
 

מהדורות אחרות - הצג הכל

מונחים וביטויים נפוצים

קטעים בולטים

עמוד 406 - ... the sky, and that not by any doubtful amount but by half or threefourths of a magnitude. One of two things was certain, either that the eye observations were wrong, or that the stars of the Milky Way are bluer or whiter than other stars. But Professor Pickering, of Cambridge, America, has lately been making a complete photographic review of the heavens, and by placing a prism in front of the telescope he has made pictures of the whole sky like this. [Here two examples of the plates of Pickering's...
עמוד 409 - Like the star That shines afar, Without haste And without rest, Let each man wheel with steady sway Round the task that rules the day, And do his best.
עמוד 295 - Eayleigh has pointed out, the eye, when its full aperture, is used, is not a perfect instrument. If we wish to realize the full resolving power of a spectroscope, therefore, the emergent beam must not be larger than about one-third of the opening of the pupil. Up to the present time the standard of reference for nearly all spectroscopic work continues to be Angstrom's map of the solar spectrum and his scale based upon his original determinations of absolute wave length.
עמוד 299 - The spectroscopic method of determining celestial motions in the line of sight has recently become fruitful in a new but not altogether unforeseen direction, for it has, so to speak, given us a separating power far beyond that of any telescope the glass-maker and the optician could construct, and so enabled us to penetrate into mysteries hidden in stars apparently single, and altogether unsuspected of being binary systems. The spectroscope has not simply added to the list of the known binary stars,...
עמוד 295 - Last year the committee added a table of corrections to Rowland's scale. The inconvenience caused by a change of standard scale is, for a time at least, considerable ; but there is little doubt that in the near future Rowland's photographic map of the solar spectrum, and his scale based on the determinations of absolute wave-length by Pierce and Bell, or the Potsdam scale based on original determinations by Miiller and Kempf, which differs very slightly from it, will come to be exclusively adopted....
עמוד 136 - ... in various ways. The main army 'of science moves to the conquest of new worlds slowly and surely, nor ever cedes an inch of the territory gained. But the advance is covered and facilitated by the ceaseless activity of clouds of light troops provided with a weapon — always efficient, if not always an arm of precision — the scientific imagination. It is the business of these enfants perdus of science to make raids into the realm of ignorance whereever they see, or think they see, a chance ;...
עמוד 423 - for the advancement and prosecution of scientific research in its broadest sense," now amounts to §25,000. As the income is already available, the trustees desire to receive applications for appropriations in aid of scientific work. This endowment is not for the benefit of any one department of science, but it is the intention of the trustees to give the preference to those investigations...
עמוד 298 - In the nebulae the elder Herschel saw portions of the fiery mist or " shining fluid " out of which the heavens and the earth had been slowly fashioned. For a time this view of the nebulae gave place to that which regarded them as external galaxies, cosmical " sand heaps," too remote to be resolved into separate stars; though, indeed, in 1858, Mr.
עמוד 356 - Accordingly, when stars having different spectra are compared, the results will not be the same as if the entire light of the stars were measured. In the latter case, the results will differ with the color of the star, according to the method of measurement employed. This is a serious defect in the measures of the brightness of the stars in catalogues hitherto published. Since the present measures relate to rays of a single wave-length, the same result should be obtained whether the method of comparison...
עמוד 113 - The lowest authentic reading in the screen was o°'6 at Stokesay, in Shropshire, but almost equally low temperatures occurred at other periods of the frost. At many places in the south and south-west of England as well as in parts of Scotland and Ireland the greatest cold throughout the period occurred at the end of November ; and at Waddon, in Surrey, the thermometer in the screen fell to 1°, a reading quite unprecedented at the close of the autumn. At Addington Hills, near Croydon, the shade thermometer...

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