Of optics, magnetism, electricity and galvanismH.C. Carey & I. Lea, M'Carty & Davis, Kimber & Sharpless, Lydia R. Bailey, Benjamin & Thomas Kite, Bennett & Walton, Marot & Walter, and Anthony Finley, 1825 |
Результаты поиска по книге
Результаты 1 – 5 из 39
Стр. 3
... fixed star , and will appear to some as large as Arcturus , to others no larger than a star of the sixth mag- nitude , and to others it must be invisible , unless the inhabitants have the assistance of glasses , or are endowed with ...
... fixed star , and will appear to some as large as Arcturus , to others no larger than a star of the sixth mag- nitude , and to others it must be invisible , unless the inhabitants have the assistance of glasses , or are endowed with ...
Стр. 11
... fixed star , and will appear to some as large as Arcturus , to others no larger than a star of the sixth mag- nitude , and to others it must be invisible , unless the inhabitants have the assistance of glasses , or are endowed with ...
... fixed star , and will appear to some as large as Arcturus , to others no larger than a star of the sixth mag- nitude , and to others it must be invisible , unless the inhabitants have the assistance of glasses , or are endowed with ...
Стр. 13
... fixed star , and will appear to some as large as Arcturus , to others no larger than a star of the sixth mag- nitude , and to others it must be invisible , unless the inhabitants have the assistance of glasses , or are endowed with ...
... fixed star , and will appear to some as large as Arcturus , to others no larger than a star of the sixth mag- nitude , and to others it must be invisible , unless the inhabitants have the assistance of glasses , or are endowed with ...
Стр. 35
... fixed in its frame , it exposes a clear surface of more than two feet eight inches in diameter , and its focus , by means of another lens , was reduced to a diameter of half an inch . The heat produced by this was so great , that iron ...
... fixed in its frame , it exposes a clear surface of more than two feet eight inches in diameter , and its focus , by means of another lens , was reduced to a diameter of half an inch . The heat produced by this was so great , that iron ...
Стр. 45
... fixed in its place a screen must be set at a pro- per distance from the lens to receive on it ima- ges of the objects out of doors . This instrument is sometimes called an artificial eye . Charles . In what respect is it like the eye ...
... fixed in its place a screen must be set at a pro- per distance from the lens to receive on it ima- ges of the objects out of doors . This instrument is sometimes called an artificial eye . Charles . In what respect is it like the eye ...
Другие издания - Просмотреть все
Часто встречающиеся слова и выражения
angle angle of incidence appear attract aurora borealis ball battery body brass called candle chain charge Charles coat colours concave mirror conductor CONVERSATION convex lens cylinder dark diameter direction discharge discharging-rod diverge double convex ductor earth elec electric fluid electrified electrometer equal excited experiment eye-glass figure fixed focal distance focus formed glass tube hand hole humours inches incident ray insulated inverted iron James knob Leyden jar looking-glass machine magnet magnified means metals move natural share needle nitric acid nosegay object object-glass oxidated paper parallel rays particles pass phial piece pith-balls placed Plate VII poles proceed produced quantity radius rays flow rays of light reflected rays reflecting telescope reflector refraction repel retina seen shock side silver spark spherical reflector stand Suppose surface telescope tin foil touch tricity Tutor vitreous humour Voltaic wire zinc
Популярные отрывки
Стр. 155 - Leyden, of much eminence, said that " he felt himself struck in his arms, shoulders, and breast, so that he lost his breath ; and it was two days before he recovered from the effects of the blow and the terror ; adding, that he would not take a second shock for the kingdom of France.
Стр. 28 - Thus with the year Seasons return ; but not to me returns Day, or the sweet approach of ev'n or morn, Or sight of vernal bloom, or summer's rose, Or flocks, or herds, or human face divine ; HIS MANLY BEAUTY.
Стр. 28 - Thus with the year Seasons return, but not to me returns Day, or the sweet approach of even or morn, Or sight of vernal bloom, or summer's rose, Or flocks, or herds, or human face divine: But cloud instead, and ever-during dark Surrounds me, from the cheerful ways of men Cut off, and for the book of knowledge fair Presented with a universal blank Of nature's works, to me expunged and rased, And wisdom at one entrance quite shut out.
Стр. 30 - Filled overflowing all those lamps of Heaven, That beam for ever through the boundless sky ; But, should he hide his face, the astonished sun, And all the extinguished stars, would loosening reel Wide from their spheres, and Chaos come again.
Стр. 31 - First the flaming red Sprung vivid forth ; the tawny orange next ; And next delicious yellow ; by whose side Fell the kind beams of all-refreshing green. Then the pure blue, that swells autumnal skies, Ethereal...
Стр. 76 - Meantime, refracted from yon eastern cloud, Bestriding earth, the grand ethereal bow Shoots up immense; and every hue unfolds, In fair proportion, running from the red To where the violet fades into the sky.
Стр. 5 - This will lead us to the explanation of one of the principal definitions in optics, viz. that the angle of reflection is always equal to the angle of incidence.
Стр. 39 - ... the angle of reflection is always equal to the angle of incidence, the image for any point can be seen only in the reflected ray prolonged.
Стр. 75 - Yes ; the three glasses next the eye having their focal distances equal, the magnifying power is found by dividing the focal distance of the object-glass by the focal distance of one of the eye-glasses.
Стр. 75 - IK ; opposite to the hole r is a small mirror L, concave towards the great one ; it is fixed on a strong wire M, and may, by means of a long screw on the outside of the tube, be made to move backwards or forwards. AB is a remote object ; from which rays will flow to the great mirror D F.