Celestial objects for common telescopesLongmans Green, 1873 |
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Page 3
... Ophiuchi , in the following catalogue . The small mirror in a Newtonian causes a central darkness out of the focus , which should be nearly the same on either side of it . 4 may be serviceable , but is not of high B 2 THE TELESCOPE . 3.
... Ophiuchi , in the following catalogue . The small mirror in a Newtonian causes a central darkness out of the focus , which should be nearly the same on either side of it . 4 may be serviceable , but is not of high B 2 THE TELESCOPE . 3.
Page 8
... central paste- board disc , supported by narrow arms from the sides , and leaving an open ring of light all round , may be tried . But for comets or nebula , it will be best to restore the original aperture , as with faint and ill ...
... central paste- board disc , supported by narrow arms from the sides , and leaving an open ring of light all round , may be tried . But for comets or nebula , it will be best to restore the original aperture , as with faint and ill ...
Page 19
... central rays of the spectrum . Herschel I. adopted , with great success , a trough containing a filtered mixture of ink and water . Cooper , at Markree Castle , Ireland , used a ' drum ' of alum water c 2 PART II THE SOLAR SYSTEM THE.
... central rays of the spectrum . Herschel I. adopted , with great success , a trough containing a filtered mixture of ink and water . Cooper , at Markree Castle , Ireland , used a ' drum ' of alum water c 2 PART II THE SOLAR SYSTEM THE.
Page 24
... central streak of a great double umbra : Secchi , during the eclipse , 1858 , March 15 , remarked a rose - coloured pro- montory in a spot visible to the naked eye . Schmidt records many tints , chiefly violet umbræ and yellowish ...
... central streak of a great double umbra : Secchi , during the eclipse , 1858 , March 15 , remarked a rose - coloured pro- montory in a spot visible to the naked eye . Schmidt records many tints , chiefly violet umbræ and yellowish ...
Page 45
... central in the field . As it advances , the part of Mercury not yet entered may be rendered visible by being projected upon the ' corona , ' which is so conspicuous in total solar eclipses , and has been known to relieve dark bodies in ...
... central in the field . As it advances , the part of Mercury not yet entered may be rendered visible by being projected upon the ' corona , ' which is so conspicuous in total solar eclipses , and has been known to relieve dark bodies in ...
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achr achromatic aperture astronomers atmosphere beautiful Binary bluish Boöt bright brighter brilliant Buffham centre Ceph Clusters colour comet constellation craters Crown 8vo curious dark Dawes diameter disc Double Stars Drac dusky Earth Edition eye-piece faint field flushed white grey Herc Herschel Huggins interior JOHN TYNDALL Jupiter Lassell libration light lilac limb luminous lunar minute stars Moon naked eye nearly Nebulæ noticed nucleus object object-glass observers orange pair pale blue pale white pale yellow photosphere Pisc planet Post 8vo proper motion Red Star reflector region remarkable revised Right Ascension ring ruddy satellites Schm Schr Schröter Schwabe Secchi seen shadow shew side smalt solar sometimes spec spots streaks Taur telescope topaz Triple visible vols Woodcuts XIVh xIxh xvih XVIII yellowish
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