Celestial Objects for Common TelescopesLongmans, Green, 1873 - 343 páginas |
Dentro del libro
Resultados 1-5 de 84
Página 7
... bright light , taking out the eye - piece , and placing the eye in the focus ; every irregularity will then be visible in the illumi- nation which overspreads the object - glass ; and , if of small extent , may be stopped out by a bit ...
... bright light , taking out the eye - piece , and placing the eye in the focus ; every irregularity will then be visible in the illumi- nation which overspreads the object - glass ; and , if of small extent , may be stopped out by a bit ...
Página 8
... bright stars by day , and identifying minute objects by night : but , to do its work , it must be placed accurately in the meridian , and out of that position has little advantage . In any case , if 8 THE INSTRUMENT AND THE OBSERVER .
... bright stars by day , and identifying minute objects by night : but , to do its work , it must be placed accurately in the meridian , and out of that position has little advantage . In any case , if 8 THE INSTRUMENT AND THE OBSERVER .
Página 11
... bright . This ' dew - cap ' must fit tight enough to stand firm , or it will bend down and intercept the light ; but not so tight as to cause trouble in removing it to put on the brass cap in the open air . It is better to blacken its ...
... bright . This ' dew - cap ' must fit tight enough to stand firm , or it will bend down and intercept the light ; but not so tight as to cause trouble in removing it to put on the brass cap in the open air . It is better to blacken its ...
Página 15
... bright objects with irradiation , or glare . Experience in all these matters is the surest guide . It may be very useful to know the diameter of the field of each of our eye - pieces . This may be obtained from the time which an object ...
... bright objects with irradiation , or glare . Experience in all these matters is the surest guide . It may be very useful to know the diameter of the field of each of our eye - pieces . This may be obtained from the time which an object ...
Página 16
... bright groups or rich fields , or for irresolvable nebulæ , which have no outlines to be deranged : a hazy or foggy night will blot out nebulæ and minute stars , but sometimes defines bright objects admirably ; never condemn such a ...
... bright groups or rich fields , or for irresolvable nebulæ , which have no outlines to be deranged : a hazy or foggy night will blot out nebulæ and minute stars , but sometimes defines bright objects admirably ; never condemn such a ...
Otras ediciones - Ver todas
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.