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 |
From inside the book
Արդյունքներ 18–ի 1-ից 5-ը:
Էջ 15
... position be true , that light consists of particles flowing from a luminous body , as the sun , and that these particles are about eight minutes in coming from the sun to us ; then if the sun were blotted from the heavens , we should ...
... position be true , that light consists of particles flowing from a luminous body , as the sun , and that these particles are about eight minutes in coming from the sun to us ; then if the sun were blotted from the heavens , we should ...
Էջ 28
... position , and I will pour in a quantity of water gradually , and tell me the appearance . Charles . The shilling rises exactly in the same proportion as you pour in the water . Tutor . Recollect then , in future , that we can- not ...
... position , and I will pour in a quantity of water gradually , and tell me the appearance . Charles . The shilling rises exactly in the same proportion as you pour in the water . Tutor . Recollect then , in future , that we can- not ...
Էջ 47
... position with the objects they represent they are also imaginary , for the re- fracted rays never meet at the foci whence they seem to diverge . F But the images of objects placed beyond the focus of THE CONCAVE LENSES . 47.
... position with the objects they represent they are also imaginary , for the re- fracted rays never meet at the foci whence they seem to diverge . F But the images of objects placed beyond the focus of THE CONCAVE LENSES . 47.
Էջ 68
... and with a little care in adjust- ing your position , you will see an inverted image of yourself in the air between you and the mirror , and of a less size than you are . When you see the image , extend your hand gently 68 OPTICS .
... and with a little care in adjust- ing your position , you will see an inverted image of yourself in the air between you and the mirror , and of a less size than you are . When you see the image , extend your hand gently 68 OPTICS .
Էջ 87
... position ? Tutor . This is a proper question , but one that is not very readily answered . It is well known that the sense of touch or feeling very much assists the sense of sight ; some paintings are so exquisitely finished , and so ...
... position ? Tutor . This is a proper question , but one that is not very readily answered . It is well known that the sense of touch or feeling very much assists the sense of sight ; some paintings are so exquisitely finished , and so ...
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Common terms and phrases
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
Սիրված հատվածներ
Էջ 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.
Էջ 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.
Էջ 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.
Էջ 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.
Էջ 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...
Էջ 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.
Էջ 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.
Էջ 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.
Էջ 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.
Էջ 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.