Celestial objects for common telescopesLongmans Green, 1873 |
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Page ix
... light , and which , as far as the sidereal portion of it is concerned , is based upon it as the standard authority . Nothing would have been easier than , on so fertile a subject , to have expanded this treatise to a much larger bulk ...
... light , and which , as far as the sidereal portion of it is concerned , is based upon it as the standard authority . Nothing would have been easier than , on so fertile a subject , to have expanded this treatise to a much larger bulk ...
Page 1
... light in reflection , not greater brightness . The original observations in the following pages * ' Aperture ' always means the clear space which receives the light of the object ; the diameter of the object - glass in achromatics , or ...
... light in reflection , not greater brightness . The original observations in the following pages * ' Aperture ' always means the clear space which receives the light of the object ; the diameter of the object - glass in achromatics , or ...
Page 3
... light . Actual performance is the only adequate test . The image should be neat and well defined with the highest power , and should come in and out of focus sharply ; that is , become indistinct by a very slight motion on either side ...
... light . Actual performance is the only adequate test . The image should be neat and well defined with the highest power , and should come in and out of focus sharply ; that is , become indistinct by a very slight motion on either side ...
Page 4
... light and darkness . This outstanding ' or uncorrected colour results from the want of a perfect balance between the optical properties of the two kinds of glass of which the object - glass is constructed : it cannot be remedied , but ...
... light and darkness . This outstanding ' or uncorrected colour results from the want of a perfect balance between the optical properties of the two kinds of glass of which the object - glass is constructed : it cannot be remedied , but ...
Page 5
... light is thus incurred , and as the inversion of celestial objects is unimportant , erecting eye - pieces ( always the longest of a set ) should never be employed for astronomy ; the eye soon becomes accustomed to the inverted picture ...
... light is thus incurred , and as the inversion of celestial objects is unimportant , erecting eye - pieces ( always the longest of a set ) should never be employed for astronomy ; the eye soon becomes accustomed to the inverted picture ...
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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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