Valerio, Luca, De centro gravitatis solidorvm libri tres
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1
PROPOSITIO IIII.
Si conoidi parabolico figura circumſcribatur,
& altera inſcribatur ex cylindris æqualium alti­
tudinum, binis circa communes axes ſegmenta
axis conoidis, & inter eadem plana parallela, mi­
nimo circumſcriptorum ad nullum relato; omnia
reſidua cylindrorum figuræ circumſcriptæ dem­
ptis figuræ inſcriptæ cylindris, & inter ſe, & mi­
nimo cylindro æqualia erunt.
Sit conoidi parabolico ABC, cuius axis BD circum­
ſcripta figura ex quotcumque cylindris æqualium altitu­
dinum, quorum tres deinceps ſint EL minimus ſupremus,
& GQ, IR, quorum baſes eodem ordine circuli, quorum
ſemidiametri ad parabolæ, quæ figuram deſcribit diame­
trum BD ordi­
natim applicatæ
ſint EF, GH, IK:
& in duplos cre­
ſcentibus cylin­
dris circa priorum
axium duplos a­
xes BH, IK, HD,
& c deinceps
quotcumque plu­
res eſsent; ſit co­
noidi ABC in­
194[Figure 194]
ſcripta figura ex cylindris æqualium altitudinum inter ſe, &
circumſcriptis.
Bini itaque circa communes axes inter ea­
dem plana parallela interijcientur, minimo EL ad nullum

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