Of optics, magnetism, electricity, & galvanismM. Carey, 1815 |
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Стр. 15
... paper , I make only a small pin - hole in it , and then through that hole , I can see all the objects , such as the sky , trees , houses , & c . as I could if the paper were not there . Charles . Do we only see objects by means of the ...
... paper , I make only a small pin - hole in it , and then through that hole , I can see all the objects , such as the sky , trees , houses , & c . as I could if the paper were not there . Charles . Do we only see objects by means of the ...
Стр. 56
... paper , and you now see that the flame of the candle is in- verted . Fames . How is this explained ? Tutor . Let A B C ( Plate 11. Fig . 12. ) represent an arrow placed beyond the focus , of a double convex lens d e f , some rays will ...
... paper , and you now see that the flame of the candle is in- verted . Fames . How is this explained ? Tutor . Let A B C ( Plate 11. Fig . 12. ) represent an arrow placed beyond the focus , of a double convex lens d e f , some rays will ...
Стр. 60
... paper in a proper place , you will see a complete invert- ed image of the candle on it . An object seen through a very small aperture appears also inverted , but it is very imperfect compared to an image formed with the lens ; it is ...
... paper in a proper place , you will see a complete invert- ed image of the candle on it . An object seen through a very small aperture appears also inverted , but it is very imperfect compared to an image formed with the lens ; it is ...
Стр. 61
... paper , and look through it at the small print of this book . James . It is , indeed , very much magnífied . Tutor . As an object approaches a con- vex lens , its image departs from it ; and as the object recedes , its image advances ...
... paper , and look through it at the small print of this book . James . It is , indeed , very much magnífied . Tutor . As an object approaches a con- vex lens , its image departs from it ; and as the object recedes , its image advances ...
Стр. 71
... paper will ex- hibit the seven following colours : red , orange , yellow , green , blue , indigo , and violet ; and now you shall hear a poet's des cription of them . -First the flaming red Sprung vivid forth ; the tawny OF COLOURS . 71.
... paper will ex- hibit the seven following colours : red , orange , yellow , green , blue , indigo , and violet ; and now you shall hear a poet's des cription of them . -First the flaming red Sprung vivid forth ; the tawny OF COLOURS . 71.
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acid angle animals appear attract aurora borealis ball battery body brass bring called candle chain charge Charles colours concave lens concave mirror conducting substance conductor CONVERSATION convex lens copper cylinder diameter discharge diverge ductor earth effect elec electric fluid electrified electrometer excited experiment eye-glass fixed focal distance focus Galvanism glass tube gold gymnotus hand hold humours inches insulated inverted iron James knob knuckle Leyden jar looking-glass magnet magnifying means metals motion natural share needle negative nerve nitric acid object object-glass oxidation paper pass phial piece of silver piece of zinc pith-balls Plate VIII poles position produced quantity rays of light reflected Refracting telescopes refraction repel retina rubber rubbing seen shock side south pole spark stand surface telescope tin foil tion touch tric fluid tricity Tutor Voltaism wire zinc
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Стр. 54 - 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 everduring 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. 121 - 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. 77 - Since c 6 is perpendicular to the glass at *), the angle of incidence is abc ; and as the angle of reflection is always equal to the angle of incidence...
Стр. 11 - 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.
Стр. 33 - A lens is glass ground into such a form, as to collect or disperse the rays of light which pass through it. These are of different shapes, and from thence receive different names.
Стр. 287 - As he was sitting with a friend in the open air, an hour after sun-set, they saw a falling, or as it is sometimes called, a shooting star, directing its course towards them, growing apparently larger and larger, till it disappeared not far from them, and, disappearing, it left their faces, hands, and clothes, with the earth, and neighbouring objects, suddenly illuminated with a diffused and lambent light, attended with no noise at all.
Стр. 129 - 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. 58 - 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. 291 - Even in the depth of polar night, they find A wondrous day; enough to light the chase, Or guide their daring steps to Finland fairs.
Стр. 121 - 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 showery...