Scientific Dialogues,: Of mechanicsBaldwin and Cradock; and R. Hunter, 1828 |
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Termos e frases comuns
angle of incidence angle of reflection artificial magnet body called centre Charles colours compass concave lens concave mirror CONVERSATION convex glass convex lens convex mirror cornea course dark diameter direction distinct vision diverge equal eye-glass farther feet focal distance formed heat humours inches incident rays inverted image James ject lenses less look looking-glass magnifying power means ment microscope move nearer needle north pole nosegay object-glass optic nerve optics painted paper parallel rays particles of light pass pencil of rays perpendicular picture piece plain mirror plane proceed produced properties rainbow rays fall rays flowing rays of light reflected rays reflecting telescope reflector refraction rendered represent retina screen seen shilling shutter side sight small hole south pole spectator stand steel suppose surface tance throw tion transparent tube Tutor violet vitreous humour
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Página 78 - 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.
Página 8 - How distant some of these nocturnal suns ! So distant (says the sage) 'twere not absurd To doubt if beams, set out at Nature's birth, Are yet arrived at this so foreign world, Though nothing half so rapid as their flight.
Página 82 - 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...
Página 7 - The empyreal waste, where happy spirits hold, Beyond this concave heaven, their calm abode ; And fields of radiance, whose unfading light Has travell'd the profound six thousand years, Nor yet arrives in sight of mortal things.
Página 165 - 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.
Página 17 - The doctrine of mirrors depends wholly on that fundamental law, that the angle of reflection is always equal to the angle of incidence.
Página 29 - The following, therefore, may be established as a sort of axiom in optics : we see every thing in the direction of that line in which the rays approach us last. - If you place a candle before a looking-glass, and stand before it, the image of the candle appears behind it; but if another looking-glass be so placed as to receive the reflected rays of the candle, and you stand before this second glass, the candle will appear behind that; because the mind imagines...
Página 97 - In the reflected portion the angle of reflection is always equal to the angle of incidence.
Página 83 - CD, be divided into 360 equal parts, the red will occupy 45 of them, the orange 27, the yellow 48, the green 60, the blue 60, the indigo 40, and the violet 80. As...
Página 166 - Shoots up immense ; and every hue unfolds, In fair proportion running from the red, To where the violet fades into the sky. Here, awful Newton ! the dissolving clouds Form, fronting on the sun, thy...