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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 161, page id 1677894601:0341
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(16T)
secundi vel superioris generis punctum duplex non
habentm commode describere Problema est inter
diffciliora numerandum.
Curvarum utus in Creometria est ut per earum
intersectiones Problemata Colvantur. PropOnatuE quatichum per a
aequatio construenda dimentionum norem XPF ) - B X7 scriptionem Cur-
t CX  dx5-] Cxt  F X3 ] 9XX ] hX  K =0. UBi varum.
M
b, C, d, Dc. Signiticant quantitates qualris datas
lignis Tuis L X - aftectas. ANumatur aequatio ad
Parabolam cubicam X = Y, ec aequatio prior, scri
Dendo Y prO X, Cradet v F BXYY F CYY + dXXY
CX V -)  in V -F FX3 - ]. 9XX ) HX ] K =0, aequatio ad
Curram aliam secundi generis. Ubi in vel Fdcese
Potest vel pro lubitu astumi. Et per harum Curra-
eum descriptiones e intersectiones dabuntur radices
aequationis construendae. Parabolam cubicam semet
deleribere sufficit.
Si aequatio construenda per defectum duorum ter-
minorum ultimorum lx X H reducatur ad septem
dimentiones, Curra altera delendo m, habebit pun-
ctum duplex in principio abscistae, et inde facile de-
Tcribi Potest ut TUPEa.
Si aequatio construenda per detectum termino-
rum trium ultimorum sZX ] RX K reducatur ad
sex dimentiones, Curra altera delendo feradet
sectio Conica.
Fit si per detectum sex ultimorum terminorum
equatio construenda reducatur ad tres dimentiones,
incidetur in constructionem Wallisianam per l’ara-
bolam cubicam et lincam rectaM.
C. On-
XXXIV.
Constructio a-