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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Стр. 90
Jeremiah Joyce. of the retina , and therefore the sensations from each eye are excited in different parts of the brain . CONVERSATION XVII . Of Spectacles , and of their Uses . Charles . Why do people wear spectacles ? Tutor . To assist ...
Jeremiah Joyce. of the retina , and therefore the sensations from each eye are excited in different parts of the brain . CONVERSATION XVII . Of Spectacles , and of their Uses . Charles . Why do people wear spectacles ? Tutor . To assist ...
Стр. 149
... excited much attention till about 200 years ago , when Dr. Gilbert , an English phy- sician , examined a great variety of substances , with a view of ascertaining how far they might or might not be ranked among electrics . Charles ...
... excited much attention till about 200 years ago , when Dr. Gilbert , an English phy- sician , examined a great variety of substances , with a view of ascertaining how far they might or might not be ranked among electrics . Charles ...
Стр. 150
Jeremiah Joyce. excited glass attracted light bodies on the side opposite to that on which it was rubbed . Charles . How did he make the discovery ? Tutor . Having laid upon the table a round piece of glass , about two inches broad , in ...
Jeremiah Joyce. excited glass attracted light bodies on the side opposite to that on which it was rubbed . Charles . How did he make the discovery ? Tutor . Having laid upon the table a round piece of glass , about two inches broad , in ...
Стр. 153
... excited . I will rub it again ; present your knuckle to it in several parts , one after another . James . What is that snapping ? I feel like- wise something like the pricking of a pin . Tutor . The snapping is occasioned by little ...
... excited . I will rub it again ; present your knuckle to it in several parts , one after another . James . What is that snapping ? I feel like- wise something like the pricking of a pin . Tutor . The snapping is occasioned by little ...
Стр. 154
... excited ? Tutor . You may rub this poker , or the round ruler for ever , without obtaining an electric spark from them . James . But you said one might get a spark from the mahogany table , if it had more than its share . Tutor . So I ...
... excited ? Tutor . You may rub this poker , or the round ruler for ever , without obtaining an electric spark from them . James . But you said one might get a spark from the mahogany table , if it had more than its share . Tutor . So I ...
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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
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Стр. 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.
Стр. 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.
Стр. 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.
Стр. 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.
Стр. 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...
Стр. 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.
Стр. 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.
Стр. 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.
Стр. 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.
Стр. 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.