Barrow, Isaac, Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur

Table of contents

< >
[21.] Lect. XV.
Page: 122 (104)
[22.] APPENDICVLA.
Page: 126 (108)
[23.] Lect. XVI.
Page: 129 (111)
[24.] Lect. XVII.
Page: 135 (117)
[25.] Lect. XVIII.
Page: 139 (121)
[26.] ERRATA.
Page: 145 (127)
[27.] Benevolo Lectori.
Page: 192
[28.] Lectio I.
Page: 194
[29.] Lect. II.
Page: 206 (13)
[30.] Lect. III.
Page: 217 (24)
[31.] Lect. IV.
Page: 222 (29)
[32.] Lect. VII.
Page: 249 (56)
[33.] Lect. VIII.
Page: 256 (63)
[34.] Lect. IX.
Page: 263 (70)
[35.] Lect. X.
Page: 268 (75)
[36.] Exemp. I.
Page: 274 (81)
[37.] _Exemp_. II.
Page: 275 (82)
[38.] _Exemp_. III
Page: 275 (82)
[39.] Exemp. IV.
Page: 276 (83)
[40.] Eæemp. V.
Page: 277 (84)
[41.] Lect. XI.
Page: 278 (85)
[42.] APPENDICUL A.
Page: 287 (94)
[43.] Lect. XII.
Page: 298 (105)
[44.] APPENDICULA 1.
Page: 303 (110)
[45.] Præparatio Communis.
Page: 303 (110)
[46.] APPENDICULA 2.
Page: 308 (115)
[47.] Conicorum Superſicies dimetiendi Metbodus.
Page: 310 (117)
[48.] Exemplum.
Page: 311 (118)
[49.] Prop. 1.
Page: 312 (119)
[50.] Prop. 2.
Page: 312 (119)
< >
page |< < (5) of 393 > >|
    <echo version="1.0RC">
      <text xml:lang="la" type="free">
        <div xml:id="echoid-div9" type="section" level="1" n="9">
          <p>
            <s xml:id="echoid-s297" xml:space="preserve">
              <pb o="5" file="0023" n="23" rhead=""/>
            cedentia; </s>
            <s xml:id="echoid-s298" xml:space="preserve">nec non ità perpetuâ deinceps ad nos deductâ ſerie; </s>
            <s xml:id="echoid-s299" xml:space="preserve">vix au-
              <lb/>
            ſim certè mihi dijudicandum accipere; </s>
            <s xml:id="echoid-s300" xml:space="preserve">adeò paribus u@raque pars ar-
              <lb/>
            gumentis niti videtur, æquis utraque difficultatibus urgeri. </s>
            <s xml:id="echoid-s301" xml:space="preserve">Quin eo
              <lb/>
            fere propendeo, ut cenſeam utroque ſubinde modo lucem procreari,
              <lb/>
            tam per effluvia corporea, quàm per continuum impulſum; </s>
            <s xml:id="echoid-s302" xml:space="preserve">ſatiúſque
              <lb/>
            fore nonnullos ejus effectus huic, alios illi tribuere. </s>
            <s xml:id="echoid-s303" xml:space="preserve">Sanè cùm ad
              <lb/>
            quantum intervallum undiquaque protenſum exiguæ lampadis flam-
              <lb/>
            mula ſe vividè conſpiciendam præbeat, adeò quidem ut integrum ejus
              <lb/>
            radiatione circumpolitum medium perfundi compleríque videatur,
              <lb/>
            animadverto; </s>
            <s xml:id="echoid-s304" xml:space="preserve">quomodo tantillum corpus tali tamdiu ſuppeditandæ
              <lb/>
            profluviorum copiæ par ſit; </s>
            <s xml:id="echoid-s305" xml:space="preserve">quomodo dum ea profundit non ipſum
              <lb/>
            pluſquam exhauriatur, & </s>
            <s xml:id="echoid-s306" xml:space="preserve">confeſtim evaneſcat, haud facile capio.
              <lb/>
            </s>
            <s xml:id="echoid-s307" xml:space="preserve">Cum verò rurſus lucis inflectiones, illáſque qui conſequuntur effectus
              <lb/>
            cogito, vix animo meo nudus impulſus facit ſatis. </s>
            <s xml:id="echoid-s308" xml:space="preserve">Itaque mentis anxi-
              <lb/>
            us hæreo. </s>
            <s xml:id="echoid-s309" xml:space="preserve">Veruntamen quia de natura lucis aliquid præſternam expe-
              <lb/>
            dit, iis quas mox tradam hypotheſibus nonnihil explicandis congruum; </s>
            <s xml:id="echoid-s310" xml:space="preserve">
              <lb/>
            hoc ſe modo, vel non abſimili rem habere concipio.</s>
            <s xml:id="echoid-s311" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s312" xml:space="preserve">VII. </s>
            <s xml:id="echoid-s313" xml:space="preserve">Pono corpus omne lucidum, ut tale, congeriem eſſe quandam
              <lb/>
            corpuſculorum ultrà pene quàm cogitari poteſt minutorum & </s>
            <s xml:id="echoid-s314" xml:space="preserve">exilium;
              <lb/>
            </s>
            <s xml:id="echoid-s315" xml:space="preserve">horum autem unumquodque vehementiſſimo motu percitum, aliquò
              <lb/>
            (ſecundum legem iſtam naturæ ſatìs receptam & </s>
            <s xml:id="echoid-s316" xml:space="preserve">exploratam) rectà
              <lb/>
            tendere; </s>
            <s xml:id="echoid-s317" xml:space="preserve">tum medium circumſtare, fluidum quoque (cujus nempe
              <lb/>
            partes nullo colligatæ nexu quaquaverſùm liberè feruntur) è corpori-
              <lb/>
            bus aggregatum, exiliſſimis quidem & </s>
            <s xml:id="echoid-s318" xml:space="preserve">illis, aſt priorum reſpectu bene
              <lb/>
            craſſis & </s>
            <s xml:id="echoid-s319" xml:space="preserve">ſolidis; </s>
            <s xml:id="echoid-s320" xml:space="preserve">ità tamen ut hoc meatus habeat, & </s>
            <s xml:id="echoid-s321" xml:space="preserve">interſtitia tenui-
              <lb/>
            oribus illis admittendis opportuna; </s>
            <s xml:id="echoid-s322" xml:space="preserve">quin & </s>
            <s xml:id="echoid-s323" xml:space="preserve">horum craſſiorum corpuſ-
              <lb/>
            culorum occurſu progreſſum impediri multorum ex illis, quæ in lucidi
              <lb/>
            ſuperficie verſantur, aut ab ea ruunt corpuſculis; </s>
            <s xml:id="echoid-s324" xml:space="preserve">ut neceſſe ſit iis ſic
              <lb/>
            inhibitis, atque repulſis introrſum ſe recipere, quo fit ut dicta conge-
              <lb/>
            ries (aliis etiam in eam aliunde confluentibus ejuſdem naturæ corpuſcu-
              <lb/>
            lis) aliquatenus intra ſuos cancellos reſtringatur, nec toto ſtatim in au-
              <lb/>
            ras expanſa diſſipetur. </s>
            <s xml:id="echoid-s325" xml:space="preserve">Interim verò complura per dictos canales re-
              <lb/>
            pertâ viâ curſum ſuum rectà continuare, materiam inibi deprehenſam
              <lb/>
            haud ita foniter obſiſtentem in fugam agentia, & </s>
            <s xml:id="echoid-s326" xml:space="preserve">ante ſe protrudentia; </s>
            <s xml:id="echoid-s327" xml:space="preserve">
              <lb/>
            quorum veſtigiis alia de lucido corpore ſimiliter prodeuntia prorſus
              <lb/>
            inſiſtent, longúmque ſimul omnia lucis rivulum efficient, indeflexâ
              <lb/>
            ſerie procurrentem. </s>
            <s xml:id="echoid-s328" xml:space="preserve">Quin & </s>
            <s xml:id="echoid-s329" xml:space="preserve">iſtorum fortè nonnulla memoratas me-
              <lb/>
            dii craſſiores particulas impetu ferire tam prævalido, nonnunquam ut
              <lb/>
            ipſas quoque cedere cogant, & </s>
            <s xml:id="echoid-s330" xml:space="preserve">ſecum conſpirantes in directum </s>
          </p>
        </div>
      </text>
    </echo>
Impressum