Of optics, magnetism, electricity, & galvanismM. Carey, 1815 |
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Page 239
... balls ( Plate vii . Fig . 3. ) made of the pith of elder : they are put on thread , and being very light , are well adapted to our purpose . While the chain is on the cushion , and I work the machine , do you bring the balls near the ...
... balls ( Plate vii . Fig . 3. ) made of the pith of elder : they are put on thread , and being very light , are well adapted to our purpose . While the chain is on the cushion , and I work the machine , do you bring the balls near the ...
Page 243
... pith - balls , which are suspended on silk ( Fig . 3. ) to the tube . They are suddenly drawn to it , and now they are repelled from one another , and likewise from the tube , for you cannot easily make them . touch it again : -but take ...
... pith - balls , which are suspended on silk ( Fig . 3. ) to the tube . They are suddenly drawn to it , and now they are repelled from one another , and likewise from the tube , for you cannot easily make them . touch it again : -but take ...
Page 246
... pith - balls were elec- trified , they repelled one another . It is a general principle in electricity that two bo ... ball , which is insulated , by a silk thread , to the con- ductor , and do you , Charles , do the same with the other ...
... pith - balls were elec- trified , they repelled one another . It is a general principle in electricity that two bo ... ball , which is insulated , by a silk thread , to the con- ductor , and do you , Charles , do the same with the other ...
Page 252
... pith - balls will not move , because glass being a non - conducting sub- stance , it has no power of carrying away the superabundant electricity from the plate suspended from the conductor . But if I hold the glass flat in my hand , the ...
... pith - balls will not move , because glass being a non - conducting sub- stance , it has no power of carrying away the superabundant electricity from the plate suspended from the conductor . But if I hold the glass flat in my hand , the ...
Page 253
Jeremiah Joyce. nected with the cushion , and two insulated pith - balls be electrified by it , they will re- pel each other . ( 3 ) If one insulated ball be electrified by the prime conductor , and another by the conductor connected ...
Jeremiah Joyce. nected with the cushion , and two insulated pith - balls be electrified by it , they will re- pel each other . ( 3 ) If one insulated ball be electrified by the prime conductor , and another by the conductor connected ...
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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...