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 |
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Стр. 31
... case , if we could live without air , and should stand with our backs to the sun , the whole heavens would appear as dark að night . CONVERSATION V. Definitions - Of the different kind of Lenses REFRACTION OF THE ATMOSPHERE . 31.
... case , if we could live without air , and should stand with our backs to the sun , the whole heavens would appear as dark að night . CONVERSATION V. Definitions - Of the different kind of Lenses REFRACTION OF THE ATMOSPHERE . 31.
Стр. 32
Jeremiah Joyce. CONVERSATION V. Definitions - Of the different kind of Lenses - Of Mr. Parker's Burning Lens , and the effects produced by it . Tutor . I must claim your attention to a few other definitions ; the knowledge of which will ...
Jeremiah Joyce. CONVERSATION V. Definitions - Of the different kind of Lenses - Of Mr. Parker's Burning Lens , and the effects produced by it . Tutor . I must claim your attention to a few other definitions ; the knowledge of which will ...
Стр. 33
... lens , of which there are several kinds . Charles . How do you describe a lens ? Tutor . A lens is a glass ground into such a form as to collect or disperse the rays of light which pass through it . They are of different shapes , from ...
... lens , of which there are several kinds . Charles . How do you describe a lens ? Tutor . A lens is a glass ground into such a form as to collect or disperse the rays of light which pass through it . They are of different shapes , from ...
Стр. 34
... lens ( Fig . 6. ) meet at a point behind it , the distance of which , from the middle of the glass , is exactly equal to the diameter of the sphere of which the lens is a portion . James . And in the case of a double - convex , is the ...
... lens ( Fig . 6. ) meet at a point behind it , the distance of which , from the middle of the glass , is exactly equal to the diameter of the sphere of which the lens is a portion . James . And in the case of a double - convex , is the ...
Стр. 35
... lens , which he used as a burning - glass ? Tutor . He formed one three feet in diameter , and when 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 ...
... lens , which he used as a burning - glass ? Tutor . He formed one three feet in diameter , and when 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 ...
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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
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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.