Of optics, magnetism, electricity and galvanismH.C. Carey & I. Lea, M'Carty & Davis, Kimber & Sharpless, Lydia R. Bailey, Benjamin & Thomas Kite, Bennett & Walton, Marot & Walter, and Anthony Finley, 1825 |
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... , BENJAMIN & THOMAS KITE , H. C. CA- REY & 1. LEA , M'CARTY & DAVIS , KIMBER & SHARP- LESS , AND LYDIA R. BAILEY . Lydia R. Bailey , Printer . 1825 . EPB PUBLIC LIBRARY 142387 ASTOR , LENOX AND TILDEN FOUNDATIONS . SCIENTIFIC DIALOGUES .
... , BENJAMIN & THOMAS KITE , H. C. CA- REY & 1. LEA , M'CARTY & DAVIS , KIMBER & SHARP- LESS , AND LYDIA R. BAILEY . Lydia R. Bailey , Printer . 1825 . EPB PUBLIC LIBRARY 142387 ASTOR , LENOX AND TILDEN FOUNDATIONS . SCIENTIFIC DIALOGUES .
Page 14
... less , according to the size of the candle : but the degree of light , like heat , diminishes in proportion as you ... less light , than we should have , if we were only one yard from it ? Tutor . I do and at three yards distance , nine ...
... less , according to the size of the candle : but the degree of light , like heat , diminishes in proportion as you ... less light , than we should have , if we were only one yard from it ? Tutor . I do and at three yards distance , nine ...
Page 31
... less bright than when it is higher up , which leads us to suppose it is farther off in the for- mer case than in the latter ; and because we imagine it to be farther from us , we take it to be a larger object than when it is higher up ...
... less bright than when it is higher up , which leads us to suppose it is farther off in the for- mer case than in the latter ; and because we imagine it to be farther from us , we take it to be a larger object than when it is higher up ...
Page 40
... less in proportion as the candle is more or less distant from the focus . Charles . If the candle be placed farther from the lens than the focus f , will the rays meet in a point after they have passed through it ? Tutor . They will ...
... less in proportion as the candle is more or less distant from the focus . Charles . If the candle be placed farther from the lens than the focus f , will the rays meet in a point after they have passed through it ? Tutor . They will ...
Page 42
... less than the object , as its distance from the glass is greater or less than the distance of the object ; if A B C ( Fig . 12 ) be the object , C b A will be the picture ; and if c b △ be the ob- ject , A B C will be the picture ...
... less than the object , as its distance from the glass is greater or less than the distance of the object ; if A B C ( Fig . 12 ) be the object , C b A will be the picture ; and if c b △ be the ob- ject , A B C will be the picture ...
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Common terms and phrases
angle angle of incidence appear attract aurora borealis ball battery body brass called candle chain charge Charles coat colours concave mirror conductor CONVERSATION convex lens cylinder dark diameter direction discharge discharging-rod diverge double convex ductor earth elec electric fluid electrified electrometer equal excited experiment eye-glass figure fixed focal distance focus formed glass tube hand hole humours inches incident ray insulated inverted iron James knob Leyden jar looking-glass machine magnet magnified means metals move natural share needle nitric acid nosegay object object-glass oxidated paper parallel rays particles pass phial piece pith-balls placed Plate VII poles proceed produced quantity radius rays flow rays of light reflected rays reflecting telescope reflector refraction repel retina seen shock side silver spark spherical reflector stand Suppose surface telescope tin foil touch tricity Tutor vitreous humour Voltaic wire zinc
Popular passages
Page 155 - Leyden, of much eminence, said that " he felt himself struck in his arms, shoulders, and breast, so that he lost his breath ; and it was two days before he recovered from the effects of the blow and the terror ; adding, that he would not take a second shock for the kingdom of France.
Page 28 - Thus with the year Seasons return ; but not to me returns Day, or the sweet approach of ev'n or morn, Or sight of vernal bloom, or summer's rose, Or flocks, or herds, or human face divine ; HIS MANLY BEAUTY.
Page 28 - 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 ever-during 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 30 - Filled overflowing all those lamps of Heaven, That beam for ever through the boundless sky ; But, should he hide his face, the astonished sun, And all the extinguished stars, would loosening reel Wide from their spheres, and Chaos come again.
Page 31 - 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 76 - 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 5 - This will lead us to the explanation of one of the principal definitions in optics, viz. that the angle of reflection is always equal to the angle of incidence.
Page 39 - ... the angle of reflection is always equal to the angle of incidence, the image for any point can be seen only in the reflected ray prolonged.
Page 75 - 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 75 - IK ; opposite to the hole r is a small mirror L, concave towards the great one ; it is fixed on a strong wire M, and may, by means of a long screw on the outside of the tube, be made to move backwards or forwards. AB is a remote object ; from which rays will flow to the great mirror D F.