A Compleat System of Opticks in Four Books, Viz. A Popular, a Mathematical, a Mechanical, and a Philosophical Treatise. To which are Added Remarks Upon the Whole. By Robert Smith, Volumen1author, and sold there, 1738 - 171 páginas |
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Página 253
... , being continual proportionals , are proportionable to their fums or to their differences . b Art . 207 . Fig . 534 649. Corol . 4. When and S 649 . CHAP . 13 . 253 FARTHER CONSIDERED , How to center an Object-glass 312 CHAP 4.
... , being continual proportionals , are proportionable to their fums or to their differences . b Art . 207 . Fig . 534 649. Corol . 4. When and S 649 . CHAP . 13 . 253 FARTHER CONSIDERED , How to center an Object-glass 312 CHAP 4.
Página 255
... ) ; 2 r R - r 2 Rr = ( Oo — Vv = ) II , and II = 2 Rr R = r II . II 2R D. By putting this value inftead of II and dividing every term by R - r , we have pl pl = -- 27 RRI + 6Rr -- 7rr PP CAHP . 13 . 255 FARTHER CONSIDERED .
... ) ; 2 r R - r 2 Rr = ( Oo — Vv = ) II , and II = 2 Rr R = r II . II 2R D. By putting this value inftead of II and dividing every term by R - r , we have pl pl = -- 27 RRI + 6Rr -- 7rr PP CAHP . 13 . 255 FARTHER CONSIDERED .
Página 257
... aberration of the extream ray is alfo 2 of its thickness , 94 and that when it is inverted , the aberration becomes only 7ths ; which is K k lefs less than the aberration of any concavo - convex glass CHAP . 13 . 257 FARTHER CONSIDERED .
... aberration of the extream ray is alfo 2 of its thickness , 94 and that when it is inverted , the aberration becomes only 7ths ; which is K k lefs less than the aberration of any concavo - convex glass CHAP . 13 . 257 FARTHER CONSIDERED .
Página 259
... . For let the perpendicular AB , to the first surface AI , crofs CD , the perpendicular to the fecond , in E ; and fuppofing the ray AC to go both Kk 2 ways Fig . 541 . ways out of the prifm , CHAP . 13 . 259 FARTHER CONSIDERED .
... . For let the perpendicular AB , to the first surface AI , crofs CD , the perpendicular to the fecond , in E ; and fuppofing the ray AC to go both Kk 2 ways Fig . 541 . ways out of the prifm , CHAP . 13 . 259 FARTHER CONSIDERED .
Página 261
... - c Art : 662 . ral aberration caused by its figure , that isqRxXEq , and the lon- E12 x Eq2 gitudinal aberration q K = 3 × EF3 E13 and in fpherical lenfes of any hape 664- a Art . 652 . * Art . 658 . CAHP.13 . 261 FARTHER CONSIDERED .
... - c Art : 662 . ral aberration caused by its figure , that isqRxXEq , and the lon- E12 x Eq2 gitudinal aberration q K = 3 × EF3 E13 and in fpherical lenfes of any hape 664- a Art . 652 . * Art . 658 . CAHP.13 . 261 FARTHER CONSIDERED .
Términos y frases comunes
aberration alfo alſo altitude angle of incidence aperture apparent diftance apparent magnitude appear arch axis bafe becauſe breadth brightneſs cafe caufe cauftick cauſe circle cofine colours concave confequently convex Corol corona curve cylinders decreaſe defcribed denfity diameter diftinct diminiſhed emergent rays equal eye-glafs fame feen femidiameter fhall fhape fhews fide fince fingle firſt fituation fmall focal diſtance focus focuſes fome fquare ftraight fubtends fucceffive fuch fun's fuppofing furface given glaffes glafs glaſs globules Hence horizon incident rays increaſe interfection inverted laft laſt lefs lens light meaſured microſcope muſt obferved object obliquely optick paffing parallel parhelia parhelion pencil perpendicular placed plane pofition prifm produced propofition ratio reafon reflected refracted rays refrangible reprefented retina ſeen ſmall ſphere ſpherical tangent teleſcope thefe theſe thofe thoſe triangles vertical whofe
Pasajes populares
Página 43 - He knew not the shape of any thing, nor any one thing from another, however different in shape, or magnitude, but upon being told what things were, whose form he before knew from feeling, he would carefully observe, that he might know them again; but having too many objects to learn at once, he forgot many of them : and (as he said) at first he learned to know, and again forgot a thousand things in a day.
Página 43 - One particular only (though it may appear trifling) I will relate. Having often forgot which was the cat, and which the dog, he was ashamed to ask ; but catching the cat (which he knew by feeling) he was observed to look at her steadfastly, and then setting her down, said, so puss ! I shall know you another time.
Página 74 - I speak of Light and Rays as coloured or endued with Colours, I would be understood to speak not philosophically and properly, but grossly, and accordingly to such Conceptions as vulgar People in seeing all these experiments would be apt to frame. For the Rays to speak properly are not coloured.
Página 43 - ... a glass of broken jelly, where a great variety of surfaces so differently refract the light, that the several distinct pencils of rays cannot be collected by the eye into their proper foci ; wherefore, the shape of an object in...
Página xiv - France and Ireland Defender of the Faith &c. To all to whom thefe Prefents fhall come Greeting.
Página 89 - Body by the vibrating Motion of the Parts of the Body, and gets beyond the reach of Attraction, being driven away with exceeding great Velocity.
Página 43 - ... (by which the rays cannot be brought into a focus upon the retina) they can discern in no other manner, than a sound eye can through a glass of broken jelly...
Página 44 - Before he was couched, he expected little advantage from seeing, worth undergoing an operation for, except reading and writing; for he said, he thought he could have no more pleasure in walking abroad than he had in the garden, which he could do safely and readily.
Página 44 - ... it; but his gratitude to his operator he could not conceal, never seeing him for some time without tears of joy in his eyes, and other marks of affection ; and if he did not happen to come at any time when he was expected, he would be so grieved, that he could not forbear crying at his disappointment.
Página 44 - A year after first seeing, being carried upon Epsom Downs, and observing a large prospect, he was exceedingly delighted with it, and called it a new kind of seeing.