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 - Science |
From inside the book
Results 1-5 of 19
Page 111
... needle in a sheet of brown paper , I can read at a very small distance indeed . Tutor . You mean , that the letters appear , in that case , very much magnified , the reason of which is , that you are able to see at a much shorter ...
... needle in a sheet of brown paper , I can read at a very small distance indeed . Tutor . You mean , that the letters appear , in that case , very much magnified , the reason of which is , that you are able to see at a much shorter ...
Page 128
... needle rubbed with a magnet , is freely suspended , it will al- ways , and in all places , stand nearly north and south . Charles . Is it known which end points to the north , and which to the south ? Tutor . Yes : or it would be of ...
... needle rubbed with a magnet , is freely suspended , it will al- ways , and in all places , stand nearly north and south . Charles . Is it known which end points to the north , and which to the south ? Tutor . Yes : or it would be of ...
Page 127
... needles and other small iron substances . James . Yes , it is called a load - stone , leading- stone , or magnet ; we have often been amused with it but you told us that it possessed a much more important property than that of ...
... needles and other small iron substances . James . Yes , it is called a load - stone , leading- stone , or magnet ; we have often been amused with it but you told us that it possessed a much more important property than that of ...
Page 128
... needle rubbed with a magnet , is freely suspended , it will al- ways , and in all places , stand nearly north and south . Charles . Is it known which end points to the north , and which to the south ? Tutor . Yes : or it would be of ...
... needle rubbed with a magnet , is freely suspended , it will al- ways , and in all places , stand nearly north and south . Charles . Is it known which end points to the north , and which to the south ? Tutor . Yes : or it would be of ...
Page 129
Jeremiah Joyce. the needle . In other words , the direction of the needle must be across the ship . Charles . Could not the same object be obtain- ed by means of the pole star ? Tutor . It might , in a considerable degree , provided you ...
Jeremiah Joyce. the needle . In other words , the direction of the needle must be across the ship . Charles . Could not the same object be obtain- ed by means of the pole star ? Tutor . It might , in a considerable degree , provided you ...
Other editions - View all
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.