Of optics, magnetism, electricity, & galvanismM. Carey, 1815 - Science |
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Page 63
... retina . James . The ball by turning in all direc tions is very like the eye , for without mov- ing the head I can look on all sides , and up- wards and downwards . Tutor . Well , we will now place the screen properly , and turn the ...
... retina . James . The ball by turning in all direc tions is very like the eye , for without mov- ing the head I can look on all sides , and up- wards and downwards . Tutor . Well , we will now place the screen properly , and turn the ...
Page 117
... retina , or net - work , which serves to receive the images of objects produced by the refraction of the different humours of the eye , and painted , as it were , on the surface . Charles . Are the humours of the eye in- tended for ...
... retina , or net - work , which serves to receive the images of objects produced by the refraction of the different humours of the eye , and painted , as it were , on the surface . Charles . Are the humours of the eye in- tended for ...
Page 118
... retina . Charles . Does the retina extend to the brain ? Tutor . It does : and we shall , when we meet next , endeavour to explain the office of these humours in effecting vision . In the mean time , I would request you to consider ...
... retina . Charles . Does the retina extend to the brain ? Tutor . It does : and we shall , when we meet next , endeavour to explain the office of these humours in effecting vision . In the mean time , I would request you to consider ...
Page 120
... retina . Tutor . Nor do I pretend to tell you in what manner the image of any object painted on the retina of the eye is calculated to con- vey to the mind an idea of that object : but I wish to show you , that the images of the various ...
... retina . Tutor . Nor do I pretend to tell you in what manner the image of any object painted on the retina of the eye is calculated to con- vey to the mind an idea of that object : but I wish to show you , that the images of the various ...
Page 121
... retina ? Tutor . It does ; and I have made use of paper because it is easily seen through , whereas the retina is opake ; transparency would be of no advantage to it . The retina , by means of the optic nerve , is conveyed to the brain ...
... retina ? Tutor . It does ; and I have made use of paper because it is easily seen through , whereas the retina is opake ; transparency would be of no advantage to it . The retina , by means of the optic nerve , is conveyed to the brain ...
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Common terms and phrases
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
Popular passages
Page 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.
Page 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.
Page 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...
Page 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.
Page 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.
Page 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.
Page 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.
Page 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...
Page 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.
Page 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...