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# Title: LBr. 943 · Tschirnhaus
# Folio 67r, page id DE-611-HS-867509:0135
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=DE-611-HS-867509&page=135
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# Lines: 33 recognised, mean confidence 0.92
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solares LC
si quaeramus curvam quae radios a specula concavo
dato reflexos iterum reflectat in unum punctum datum
inveniatur curva AA AA. et sumto ex. g. radio
1C1A is producatur et ino sumatur
punctum 20 tale, ut fiat h, A + 1ACd aequ.
curvae AA, inde ab aliquo puncto ZiA.
et punctum co erit punctum curvae quaesilae
videndum tamen quid fiat si 3 sit sumtum
extra curvam AA
Caeterum res redibit ad hoc problema
frgonometricum data basem in triangulo
B, A data pasi h. A, et angulo d1AB et summa
laterum, ha. o A; invenire triangulum sane si Ellipsis
describeretur cujus distantia foc. sint h et. A,  axis autem
per hos focos transiens sit data summa ea secabit rectam
A_ in E sed idem praestati potet sine Ellipsi
videndum faltim accuratius an nostrum Theorema generale
locum habeat etiam cum rectae non sunt paralleli sed con-
um
satie
Currentes in uno puncto. Et luideo rem succedere in
casu proposito, ubi scilicet anguli incidentiae d et
delorsionis reflexionis aequales sive convergant radii
incidentes sint paralleli, sivesveniant  uno puncto.
sed cum punctum datum non incidit incurvam AA, tunc
bi curvo
hhoc nit refert  incipiendum sallem a puncto, 
AA et quae sita co coincidunt, et a summa ista deinde
agrua
sit acuorrunt
dectiahenda recta ab h usque ad punction concursus, residum aequabitur
cirvae inde a puncto ccursus.