Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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ponitur ipſum _triangulum rectangulum_ VKD; </
s
>
<
s
xml:id
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echoid-s8822
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xml:space
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">& </
s
>
<
s
xml:id
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echoid-s8823
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xml:space
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">è circulis ad quas
<
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ceu radios deſcriptis ipſe _conus_ conflatur. </
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<
s
xml:id
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echoid-s8824
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xml:space
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">Ergò, diſputat, ex ho-
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rum circulorum peripheriis _Superficies conica_ componetur; </
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<
s
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echoid-s8825
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xml:space
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">qnod
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tamen veritati comperitur adverſari; </
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<
s
xml:id
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echoid-s8826
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xml:space
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">methodúſque proinde fallax
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eſt. </
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<
s
xml:id
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xml:space
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">Repono, malè calculum hoc pacto iniri; </
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>
<
s
xml:id
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xml:space
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">& </
s
>
<
s
xml:id
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echoid-s8829
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xml:space
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">in peripheriarum è
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quibus _Superficies_ conſtant computatione diverſam inſtituendam eſſe
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rationem ab ea, quâ computantur lineæ quibus _planæ ſuperficies_ con-
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ſtant, aut plana, è quibus corpora formantur. </
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>
<
s
xml:id
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echoid-s8830
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xml:space
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preserve
">Nempe peripheria-
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rum Superficiem curvam conſtituentium è revolutione prognatam
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lineæ VD cenſeri debet è multitudine punctorum, quæ ſunt in ipſa
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<
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">Fig. 10, 11, 12.</
note
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linea genetrice VD; </
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<
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">quippe cùm per ea ſingula puncta tales peri-
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pheriæ tranſeant, nec plures tranſire queant; </
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>
<
s
xml:id
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xml:space
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preserve
">quicunque ſit axis, ſeu
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longiùs diſtans, ſeu propiùs adjacens; </
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<
s
xml:id
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xml:space
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">axis enim ſolummodò, pro
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longiore vel propiore diſtantia poſitionéque varia, dictarum periphe-
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riarum magnitudinem determinat. </
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<
s
xml:id
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xml:space
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">Verùm multitudo linearum ex
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quibus planum DVK ſupponitur conſtare, planorúmque quibus
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Solidum DVY conſtat, è numero taxanda eſt punctorum in axe
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VK; </
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<
s
xml:id
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xml:space
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">nec enim plures intra terminos VK parallelæ, ipſi VK perpen-
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diculares, rectæ, vel plura talia parallela plana duci poſſunt, quam
<
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horum punctorum multitudini æquinumera. </
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<
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xml:id
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xml:space
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">Quod obſervando _diſcri-_
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_men_ (ſedulò perpendendum) omnem devitabimus errorem, & </
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<
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xml:space
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">_cur-_
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_varum bujuſmodi rot@tu genitarum Superficierum facillimo, reor,_
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_omnium quos rei natura ſubminiſtr at modo perquiremus._ </
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<
s
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xml:space
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">Illum com-
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monſtrabo. </
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<
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">Pro reperienda v. </
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<
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">g. </
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<
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xml:space
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">dimenſione _curvæ ſuperficiei_ lineæ
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VD circa axem VK revolutione, concipiatur ipſa VD in directum
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extendi, ità ſcilicet ut ei exæquetur recta VD; </
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>
<
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xml:space
="
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">& </
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>
<
s
xml:id
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xml:space
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">ad ejus omnia
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puncta rectæ concipiantur applicari ipſi VD perpendiculares, & </
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>
<
s
xml:id
="
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xml:space
="
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">pe-
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ripheriis circularibus, è quibus Superficies curva conflatur, ordine
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pares; </
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>
<
s
xml:id
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xml:space
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">ſingulæ ſingulis, puta AX ipſi AY, & </
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<
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xml:id
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xml:space
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">CX ipſi CY, ac
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ità continuò. </
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<
s
xml:id
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xml:space
="
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">Erit ex his parallelis rectis conſtitutum planum VDX
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æquale _dictæ curvæ ſuperficiei;_ </
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<
s
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xml:space
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">hujúſque partes illius partibus re-
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ſpectivis. </
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<
s
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xml:space
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">Sin loco _peripberiarum_ applicentur ipſarum reſpectivi radii
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AZ, BZ, CZ, & </
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">reliqui; </
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<
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xml:space
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">ſpatium ex his rectis conſtitutum (quæ
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ſanè proportionali cum alteris ſerie procedunt) ſe habebit ad _curvam_
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_Superficiem, ut c@rculi cujuſvis radius ad ejus circumſerentiam._ </
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<
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">Un-
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de ſiquâ ratione deprehendi poſſit _Summa radiorum peromnia lineæ_
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_genetricis puncta tranſeuntium (hoc eſt ſi ſpatii VDZ dimenſionem_
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reperire contigerit) eo ſtatim innoteſcet _curvæ Superſiciei dimenſio._
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</
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<
s
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">In exemplum, facilitatis ergò, proponatur _conica Superficies_ DVY,
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è rotatu procreata rectæ VD, circa axem VK. </
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<
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