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# Title: Erhardi Weigelii Sacrae Caesar. Maiest. ut & Com. Pal. Sultzb. Consiliarii, Supr. Artium Archit. Directoris Saxo Ien. Mathemat. PP. totius Academiae Senioris, Philosophia Mathematica (shelfmarks Leibn. Marg. 65; ZEN Leibn. Marg. 65)
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DDE DIRECTIONS
Productum I.
ArCUSADBCIrCUFereNLX ADBC.
aqualiter utrimque ad lubtentam
luam AB inclinatur.
Demonstratio.
Concipiatur in Fis. 20. tum subtenta AB,
tum arcus ipse ADB, DiCariam diris9 per C. D. al.
tero lemisse alteri, reflexione Facta, congrue im
polico, quod postutatum elt aequissimuum certis.
Simumque. Ciumque Circuli ejusdem racii qui-
cumque inter le aeguentur, per Dictam. 26. illico
ad mentis oculum patebit, inclinationes utro.
Dique inter se consruere. Oux vero congru
unt aequalia Tunt, per Dictam. 17. O. H. D.
pe
Productum II.
Tractus rectus AB. tractui recto
CD (Fig. IL. d eransverlalis, ambo
inter le, ex puncto incidentia
collineant contiouo autrecté aue
oblique, ita quidem ut Obliqui-
o
tacesbinae, hnc a inde (lcil. cb.
ac
tula hinc, acuta inde) juneta binis
rectis diversenciis aeguentur.
Demonstratio.
treFCACM LEREreNE, (I I UMaM Partem
maGIS
10C