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. 143
... conducting substances . The magnetic virtue is retained by iron , but it pervades all other bodies . On the contrary : the magnetic power differs from the electric , as it does not affect senses with light , smell , taste , or noise ...
... conducting substances . The magnetic virtue is retained by iron , but it pervades all other bodies . On the contrary : the magnetic power differs from the electric , as it does not affect senses with light , smell , taste , or noise ...
Стр. 156
... conducting substances had been used , instead of silk , to suspend the iron poker ? Tutor . If I had suspended the poker with a moistened hempen string , the electric fluid would have all passed away through that , and there would have ...
... conducting substances had been used , instead of silk , to suspend the iron poker ? Tutor . If I had suspended the poker with a moistened hempen string , the electric fluid would have all passed away through that , and there would have ...
Стр. 160
... conducting substance , instead of glass ? Tutor . It would ; but there is a much easier method : I will attach one end of this brass chain to the cushion at R , which being several feet long , lies on the table , or on the floor , and ...
... conducting substance , instead of glass ? Tutor . It would ; but there is a much easier method : I will attach one end of this brass chain to the cushion at R , which being several feet long , lies on the table , or on the floor , and ...
Стр. 161
... conducting bodies , I will now throw another brass chain over the conductor , so that one end of it may lie on the floor . See now if you can get any sparks , while I turn the machine . James . No , I can get none , put my knuckle as ...
... conducting bodies , I will now throw another brass chain over the conductor , so that one end of it may lie on the floor . See now if you can get any sparks , while I turn the machine . James . No , I can get none , put my knuckle as ...
Стр. 163
... conducting substances , is said to be insulated . Thus a body suspended on a silk line is insu- lated , and so is any substance that stands on glass , or resin , or wax , provided that these are in a dry state , for moisture will ...
... conducting substances , is said to be insulated . Thus a body suspended on a silk line is insu- lated , and so is any substance that stands on glass , or resin , or wax , provided that these are in a dry state , for moisture will ...
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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.