Celestial Objects for Common TelescopesLongmans, Green, 1873 - 343 páginas |
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Página 3
... point , accurately round , without wings , ' or rays , or mistiness , or false images , or appendages , except one or two narrow rings of light , regularly circular , and concentric with the image ; and in an uniformly dark field ; a ...
... point , accurately round , without wings , ' or rays , or mistiness , or false images , or appendages , except one or two narrow rings of light , regularly circular , and concentric with the image ; and in an uniformly dark field ; a ...
Página 9
... point of comfort as well as economy of time . It used to be an expensive luxury ; but a very simple and cheap ' telescope - house , ' combining shelter with open - air freedom , to the great merit of which I can bear full testimony ...
... point of comfort as well as economy of time . It used to be an expensive luxury ; but a very simple and cheap ' telescope - house , ' combining shelter with open - air freedom , to the great merit of which I can bear full testimony ...
Página 10
... point it by means of the finder ; to adjust the focus to the eye ( remembering that different eyes require different adjustments ) , are processes scarcely requiring instruction . But many mistakes may be made in detail ; and in this ...
... point it by means of the finder ; to adjust the focus to the eye ( remembering that different eyes require different adjustments ) , are processes scarcely requiring instruction . But many mistakes may be made in detail ; and in this ...
Página 21
... point the tele- scope till the finder shows it centrally on the hand , or on a paper held behind it ; or bring it to shine through the eye - piece before the dark cap is screwed on . With these precautions , there is no fear for an ...
... point the tele- scope till the finder shows it centrally on the hand , or on a paper held behind it ; or bring it to shine through the eye - piece before the dark cap is screwed on . With these precautions , there is no fear for an ...
Página 22
... points especially worthy of attention : 1 , the dark spots ; 2 , the faculæ ; 3 , the mottled appearance ; 4 , the transparent atmosphere . 1. The Dark Spots . These are not always visible ; the disc is occasionally entirely free from ...
... points especially worthy of attention : 1 , the dark spots ; 2 , the faculæ ; 3 , the mottled appearance ; 4 , the transparent atmosphere . 1. The Dark Spots . These are not always visible ; the disc is occasionally entirely free from ...
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Términos y frases comunes
achr achromatic aperture Aquil astronomers atmosphere beautiful Binary bluish Boöt bright brighter brilliant Buffham Cassini centre Ceph Clusters colour comet constellation craters curious dark Dawes deep diameter disc Double Stars Drac dusky Earth eye-piece faint field flushed white globe greenish grey Herc Herschel Huggins interior Jupiter larger Lassell libration light lilac limb luminous lunar minute stars Moon motion naked eye nearly nebulæ noticed nucleus object object-glass observers orange pair pale blue pale white pale yellow photosphere Pisc planet proper motion Red Star reflector region remarkable Right Ascension ring ruddy satellites Schm Schr Schröter Schwabe Secchi seen shadow shew side silvery white smaller smalt solar sometimes spec spots streaks surface Taur telescope topaz Triple Virg visible xIxh xvih XVIII yellowish
Pasajes populares
Página 345 - A NEW STAR ATLAS, for the Library, the School, and the Observatory, in Twelve Circular Maps (with Two Index Plates). Intended as a Companion to ' Webb's Celestial Objects for Common Telescopes.
Página 46 - Fairest of stars, last in the train of night, If better thou belong not to the dawn, Sure pledge of day, that crown'st the smiling morn With thy bright circlet, praise Him in thy sphere, While day arises, that sweet hour of prime.
Página 182 - Lift up your eyes on high, and behold who hath created these things, that bringeth out their host by number; he calleth them all by names by the greatness of his might, for that he is strong in power; not one faileth.
Página 345 - Why didn't somebody teach me the constellations, too, and make me at home in the starry heavens which are always overhead, and which I don't half know to this day?
Página 30 - I have said, he spent to satisfy himself; six more years to satisfy, and still thirteen more to convince, mankind. For thirty years never has the Sun exhibited his disc above the horizon of Dessau without being confronted by Schwabe's imperturbable telescope, and that appears to have happened, on an average, about 300 days a year.
Página 65 - Webb makes the following remarks on the rills:—"These most singular furrows pass chiefly through levels, intersect craters (proving a more recent date), reappear beyond obstructing mountains, as though carried through by a tunnel, and commence and terminate with little reference to any conspicuous feature of the neighbourhood.