Of optics, magnetism, electricity, & galvanismM. Carey, 1815 |
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Страница 38
... gold and silver fish , I thought them very large ; but if I looked down upon them from the top , they appear much smaller indeed . Tutor . Here the convex or round shape of the glass becomes a magnifier , the reason of which will be ...
... gold and silver fish , I thought them very large ; but if I looked down upon them from the top , they appear much smaller indeed . Tutor . Here the convex or round shape of the glass becomes a magnifier , the reason of which will be ...
Страница 49
... melt all the metals ? Tutor . It would even gold was ren- dered fluid in a few seconds ; notwithstand- ing , however , this intense heat at the focus , VOL . III . E " As the sum of the radii of both curves OF THE BURNING - GLASS . 49.
... melt all the metals ? Tutor . It would even gold was ren- dered fluid in a few seconds ; notwithstand- ing , however , this intense heat at the focus , VOL . III . E " As the sum of the radii of both curves OF THE BURNING - GLASS . 49.
Страница 49
... Tutor . It would even gold was ren- dered fluid in a few seconds ; notwithstand- ing , however , this intense heat at the focus , VOL . III . E the finger might , without the smallest in- jury , OF THE BURNING - GLASS . 49.
... Tutor . It would even gold was ren- dered fluid in a few seconds ; notwithstand- ing , however , this intense heat at the focus , VOL . III . E the finger might , without the smallest in- jury , OF THE BURNING - GLASS . 49.
Страница 80
... gold : And speak their sovereign's state . He comes , behold ! Fountain of light and colour , warmth and life ! The king of glory ! MALLET . Charles . Are we to understand that all colours depend on the reflection of the seve ral ...
... gold : And speak their sovereign's state . He comes , behold ! Fountain of light and colour , warmth and life ! The king of glory ! MALLET . Charles . Are we to understand that all colours depend on the reflection of the seve ral ...
Страница 81
... gold - leaf reflects the yellow , but it transmits a sort of green colour by holding it up against a strong light . J Mr. Delaval , a gentleman who a few years since made many experiments to as- certain how colours are produced , under ...
... gold - leaf reflects the yellow , but it transmits a sort of green colour by holding it up against a strong light . J Mr. Delaval , a gentleman who a few years since made many experiments to as- certain how colours are produced , under ...
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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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Страница 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.
Страница 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.
Страница 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...
Страница 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.
Страница 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.
Страница 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.
Страница 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.
Страница 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...
Страница 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.
Страница 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...