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 |
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Стр. 73
... humour , and the screen to the retina . James . The ball by turning in all directions is very like the eye , for without moving the head I can look on all sides , and upwards and down- wards . Tutor . Well , we will now place the screen ...
... humour , and the screen to the retina . James . The ball by turning in all directions is very like the eye , for without moving the head I can look on all sides , and upwards and down- wards . Tutor . Well , we will now place the screen ...
Стр. 141
... humours . This figure ( Plate III . Fig . 25. ) represents the section of an eye , that is , an eye cut down the middle ; and Fig . 26 , the front view of an eye as it appears in the head . Charles . Have these coats and humours all ...
... humours . This figure ( Plate III . Fig . 25. ) represents the section of an eye , that is , an eye cut down the middle ; and Fig . 26 , the front view of an eye as it appears in the head . Charles . Have these coats and humours all ...
Стр. 144
... less than the cho- roides ? Tutor . It is called the retina , or net - work , which serves to receive the images of objects produced by the refraction of the different humours of the eye , and painted , as it were 144 OPTICS .
... less than the cho- roides ? Tutor . It is called the retina , or net - work , which serves to receive the images of objects produced by the refraction of the different humours of the eye , and painted , as it were 144 OPTICS .
Стр. 145
... humours of the eye intended for refracting the rays of light , in the same manner as glass lenses ? Tutor . They are ; and they are called the vitreous , the crystalline , and the aqueous humours . The vi- treous humour fills up all the ...
... humours of the eye intended for refracting the rays of light , in the same manner as glass lenses ? Tutor . They are ; and they are called the vitreous , the crystalline , and the aqueous humours . The vi- treous humour fills up all the ...
Стр. 146
... humours in effecting vision . In the mean time , I would request you to consider again what I have told you of the different parts of the eye ; and exa- mine , at the same time , both figures ; viz . 25 and 26 . James . We will : but ...
... humours in effecting vision . In the mean time , I would request you to consider again what I have told you of the different parts of the eye ; and exa- mine , at the same time , both figures ; viz . 25 and 26 . James . We will : but ...
Часто встречающиеся слова и выражения
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
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Стр. 80 - 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.
Стр. 85 - 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. 8 - 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.
Стр. 109 - ... 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.
Стр. 166 - 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. 172 - 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...
Стр. 187 - 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.
Стр. 49 - 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.
Стр. 61 - 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...