Of optics, magnetism, electricity, & galvanismM. Carey, 1815 |
From inside the book
Արդյունքներ 38–ի 1-ից 5-ը:
Էջ 31
... figure , and con- ceive your eye to be at s , a b the side of the pan , and the piece of money to be at x : now when the pan is empty , the rays of light flow from x , in the direction x am , but your eye is at s , of course you cannot ...
... figure , and con- ceive your eye to be at s , a b the side of the pan , and the piece of money to be at x : now when the pan is empty , the rays of light flow from x , in the direction x am , but your eye is at s , of course you cannot ...
Էջ 45
... figure represent ? Tutor . It represents a glass 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 ...
... figure represent ? Tutor . It represents a glass 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 ...
Էջ 46
... figure ( Fig . 6. ) now a , b , m , & c . represent parallel rays , falling upon c d a convex surface , of glass for instance , all of which , except the mid- dle one , fall upon it obliquely , and , accord- ing to what we saw yesterday ...
... figure ( Fig . 6. ) now a , b , m , & c . represent parallel rays , falling upon c d a convex surface , of glass for instance , all of which , except the mid- dle one , fall upon it obliquely , and , accord- ing to what we saw yesterday ...
Էջ 52
... figures 6 and 8 , and see that the rays falling upon the lenses are parallel to one another : are the sun's rays parallel ? Tutor . They are considered so : but you must not suppose that all the rays that come from the surface of an ...
... figures 6 and 8 , and see that the rays falling upon the lenses are parallel to one another : are the sun's rays parallel ? Tutor . They are considered so : but you must not suppose that all the rays that come from the surface of an ...
Էջ 93
... figure ? Tutor . I will endeavour to do so . Let AB ( Plate II . Fig . 17. ) be , a concave mirror , and M E any remote object , from every part of which rays will proceed to every point of the mirror ; that is , from the point м rays ...
... figure ? Tutor . I will endeavour to do so . Let AB ( Plate II . Fig . 17. ) be , a concave mirror , and M E any remote object , from every part of which rays will proceed to every point of the mirror ; that is , from the point м rays ...
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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
Սիրված հատվածներ
Էջ 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.
Էջ 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.
Էջ 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...
Էջ 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.
Էջ 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.
Էջ 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.
Էջ 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.
Էջ 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...
Էջ 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.
Էջ 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...