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# Title: Leibniz-Handschriften zur Mathematik LH 35, 13, 3 (shelfmark LH 13, 3)
# Folio 49v, page id 00068200:0100
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quae in eodem plano descriptae in aliud planum
projiciunt circulos concentricos. U
utilior solidi quam plani consideratio ad theoremata
ad problemata an quadraturas; quia in solido res alioqui
dissitae a natura sunt copulatae, quae alioqui in plano
disitae videntur, et vix multo calculo connectuntur
Et generaliter quo plus in aliqua notione realitatis
est, eo foccundior est ejus contemplatia.
possumus conipere radios lucis moveri in circulis
vel aliis curvis iisdem vel diversis. Adde huc
usum cu superficiei hyperbolici convidis quae descrbitur per lineae
rectae motum. Tota nim ista consideratio non tam optica
quam Geometrica. Lux et projectio imaginationis tantum
gratia adhribetur. Res eo redit quomodo punctis respondenti cujusdam
suptificioi planae vel non planae; puncta respondentia in alia superficie
notari possint: modo alia illo facile haberi possint ex his datis
et contra Ac modo  per hujusmodi projectionem saepe figurae
difficulter tractabiles in facile tractabiles transmntentur.
potest ad hiberi consideratio motus: imo et refractionum.
recta
Quoniam intersectio circuli et circuli, vel circuli er conicae, dat
projiliendo intersectionem (onica et Conicus, vel circulie Coniai et
rectae, hinc derivari poterit quibus modis problema plana
Adoe huc de sectionibus
reddi possint in speciem solida.
sub contrariis, item eum bases sunt conica, nam quavis
 circulus in basin projectus fit conica