Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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eiuſdem AC ſit vt XS ad V. igitur duæ antecedentes
RX, & XS ad V, ſcilicet RS ad V eamdem propor­
tionem habebit quam raritas ſpecifica aggregati ex
EF, & FG ad raritatem AC, ſuntquè moles EH, &
AC æquales, ergo eorum raritates abſolutæ ſunt pro­
portionales ſpecificis, ſcilicèt ſe habent vt RS ad V.
quod erat, &c.
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
PROP. XCII.
Cylindrum compoſitum ex duobus cylindris inæqualitèr ra­
ris transformare in cylindrum ſimilitèr excauatum,
cuius pars continens homogenea, & æqualis ſit.
vni illorum, pars verò excauata homo­
genea, & æqualis ſit reliquo.
SIt datus cylindrus ſoli­
73[Figure 73]
dus AC, compoſitus ex
duobus cylindris AD, & DB
inæqualitèr raris alium cy­
lindrum ſimilitèr excauatum
æqualem, & ſimilem illi de­
ſcribere, cuius pars continens æqualis, & homoge­
nea ſit ipſi AD, contenta verò æqualis, & homoge­
nea ſit ipſi DB. reperto centro que cylindricæ figuræ
AC coniungantur rectæ AQ, BQ ad terminos lateris
cylindri AB, & fiat triangulum ENF ſimile, & æqua­
le ipſi AQB. poſtea inter AB, & MB reperiantur duæ
mediæ proportionales, quarum maior ſit PB (vt do­
cuimus lib. 5. conic.
Apoll.lemm. 7.) deinde in trian-

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