Scientific Dialogues: Intended for the Instruction and Entertainment of Young People, Inwich the First Principles of Natural and Experimental Philosophy are Fully Explained. Vol. II, IV-VI.J. Johnson, 1809 |
Részletek a könyvből
1 - 5 találat összesen 18 találatból.
6. oldal
... sixteen minutes later , if the earth were in that part of its orbit , which is farthest from Jupiter , than if it were in the opposite point of the heavens . Charles . I understand this : the earth may sometimes 6 OPTICS . .T.
... sixteen minutes later , if the earth were in that part of its orbit , which is farthest from Jupiter , than if it were in the opposite point of the heavens . Charles . I understand this : the earth may sometimes 6 OPTICS . .T.
18. oldal
... opposite side . James . You see , instead of coming back to your hand , it goes off to the other corner , directly opposite to the place from which you sent it . Tutor . This will lead us to the explanation of one of the principal ...
... opposite side . James . You see , instead of coming back to your hand , it goes off to the other corner , directly opposite to the place from which you sent it . Tutor . This will lead us to the explanation of one of the principal ...
20. oldal
... the point be exactly in the middle of one side of the room , a perpendicular is readily drawn by finding the middle of the opposite side , and joining the two points . reflected ray , is called the angle of reflection . 1 20 OPTICS .
... the point be exactly in the middle of one side of the room , a perpendicular is readily drawn by finding the middle of the opposite side , and joining the two points . reflected ray , is called the angle of reflection . 1 20 OPTICS .
21. oldal
... opposite side . Tutor . The reason of this is , that the rays of light flowing from you to the glass , are reflected to the other side of the room . Charles . Then if I go to that part , LIGHT REFLECTED FROM GLASS . 21.
... opposite side . Tutor . The reason of this is , that the rays of light flowing from you to the glass , are reflected to the other side of the room . Charles . Then if I go to that part , LIGHT REFLECTED FROM GLASS . 21.
71. oldal
... opposite wall , the image is large , but as you come nearer to the wall , the image is small , and the distance between the candle and glass is very much in- creased . I will now show you an instru- ment , called a Scioptric Ball ...
... opposite wall , the image is large , but as you come nearer to the wall , the image is small , and the distance between the candle and glass is very much in- creased . I will now show you an instru- ment , called a Scioptric Ball ...
Gyakori szavak és kifejezések
A B C A B Plate angle of incidence angle of reflection appear attract body called Charles colours compass concave lens concave mirror CONVERSATION convex lens convex mirror dark diameter direction distinct vision diverge double convex equal eye-glass farther feet figure flected focal distance focus of parallel formed half humours inches incident rays inverted image iron James ject lenses Let A B light flowing look looking-glass magnifying power means microscope move nearer needle nosegay object object-glass optic optic nerve painted parallel rays pass pencil of rays perpendicular piece plain mirror Plate 11 proceed radius rainbow rays fall rays flowing rays of light reflected rays reflecting telescope refraction retina seen shutter side small hole south pole spectator stance stand steel Suppose surface throw tion transparent tube Tutor violet vitreous humour
Népszerű szakaszok
80. oldal - 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 ; 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 an universal blank Of nature's works, to me expung'd and ras'd, And wisdom at one entrance quite shut out.
85. oldal - 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...
8. oldal - 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 arriv'd at this so foreign world ; Though nothing half so rapid as their flight.
109. oldal - ... as 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.
166. oldal - 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.
172. oldal - Died in the fainting Violet away. These, when the clouds distil the rosy shower, Shine out distinct adown the watery bow ; While o'er our heads the dewy vision bends Delightful, melting on the fields beneath. Myriads of mingling dyes from these result, And myriads still remain ; infinite source Of beauty, ever blushing, ever new. Did ever poet image aught so fair, Dreaming in whispering groves, by the hoarse brook; Or prophet, to whose rapture heaven descends...
187. oldal - Yes; the three glasses next the eye baving 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.
49. oldal - 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.
61. oldal - If anoto glass, FG, of the same convexity as DE, be placed in the rays at the same distance from the focus, it will refract them so, as that, after going out of it, they will be all parallel...