Celestial objects for common telescopesLongmans Green, 1873 |
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Page 1
... equal brightness as 8 to 5. Dawes gives this value for Gregorians , but like Herschel II . rates Newtonians as 7 to 5. Steinheil has ascribed much more light to achromatics . Arago strangely asserted that none B were for the most part ...
... equal brightness as 8 to 5. Dawes gives this value for Gregorians , but like Herschel II . rates Newtonians as 7 to 5. Steinheil has ascribed much more light to achromatics . Arago strangely asserted that none B were for the most part ...
Page 2
... equal light to silvered Newtonians of 9 , 63 , and 4 , and achromatics of 8 , 5 , and 4 inches respectively . * The focal length is measured from the object - glass , or speculum , to the spot where the rays cross and form a picture of ...
... equal light to silvered Newtonians of 9 , 63 , and 4 , and achromatics of 8 , 5 , and 4 inches respectively . * The focal length is measured from the object - glass , or speculum , to the spot where the rays cross and form a picture of ...
Page 5
... equal power . The focal picture , as in the camera , is always inverted , and so in the astronomical eye - piece it remains . * For terres- trial purposes it is erected by two additional lenses ; but a loss of light is thus incurred ...
... equal power . The focal picture , as in the camera , is always inverted , and so in the astronomical eye - piece it remains . * For terres- trial purposes it is erected by two additional lenses ; but a loss of light is thus incurred ...
Page 28
... equal on both sides , 456 giving the perspective of depression , 74 the reverse ; in latitude , 72 cases for , 17 against depression , which they consider sufficiently established . † An indentation on a globe will disappear in profile ...
... equal on both sides , 456 giving the perspective of depression , 74 the reverse ; in latitude , 72 cases for , 17 against depression , which they consider sufficiently established . † An indentation on a globe will disappear in profile ...
Page 84
... equal distinctness , and it was observed for 2h , the terminator in X remaining perfectly still . This is a very strange story , yet Lambert seems to have believed it ; and perhaps we cannot pronounce it wholly incredible in the face of ...
... equal distinctness , and it was observed for 2h , the terminator in X remaining perfectly still . This is a very strange story , yet Lambert seems to have believed it ; and perhaps we cannot pronounce it wholly incredible in the face of ...
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Common terms and phrases
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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