Of optics, magnetism, electricity, & galvanismM. Carey, 1815 - Science |
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Page 43
... case , if we could live without air , and should stand with our backs to the sun , the whole heavens would appear as dark as night . CONVERSATION V. Definitions -- Of the different kind of Lenses REFRACTION OF THE ATMOSPHERE . 43.
... case , if we could live without air , and should stand with our backs to the sun , the whole heavens would appear as dark as night . CONVERSATION V. Definitions -- Of the different kind of Lenses REFRACTION OF THE ATMOSPHERE . 43.
Page 44
Jeremiah Joyce. CONVERSATION V. Definitions -- Of the different kind of Lenses -- Of Mr. Parker's Burning Lens , and the effects pro- duced by it . TUTOR . I must claim your attention to a few other definitions ; the knowledge of which ...
Jeremiah Joyce. CONVERSATION V. Definitions -- Of the different kind of Lenses -- Of Mr. Parker's Burning Lens , and the effects pro- duced by it . TUTOR . I must claim your attention to a few other definitions ; the knowledge of which ...
Page 45
... 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 ...
Page 46
... lens , because both sides are convex ; D is a double con- cave , because both sides are concave ; and E is called a meniscus , being convex on one side , and concave on the other ; of this kind are all watch glasses . James . I can ...
... lens , because both sides are convex ; D is a double con- cave , because both sides are concave ; and E is called a meniscus , being convex on one side , and concave on the other ; of this kind are all watch glasses . James . I can ...
Page 47
... 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 con- vex , 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 con- vex , is the ...
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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...