Cataneo, Girolamo - Hier. Cataneus de arte bellica, sive, de designandis ac construendis arcibus & propugnaculis, necnon & de iis oppugnandis, expugnandis ac propugnandis : de itinere exercitus, ac castrametatione, quando expediat manus cum hoste conserere

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157

Sit linea non terminata AB: punctum verò extra
eam datum C, à quo volumus in dictam lineam per-
pendicularem lineam ducere. Primò pedem circini im
mobilem figemus in dicto puncto C: alterum pedem
extendemus donec datam lineam interſecet: quod ſi
primò nequeat, extendemus donec fieri poſſit interſe-
ctio: & cum hac apertura circulum deſcribemus, qui
quidem circulus lineam in duobus punctis interſeca-
bit, ſcilicet in D & E: à puncto verò C ad duo puncta
D & E, duas lineas rectas ducemus, quæ erũt DC & CE,
& angulum DCE diuidemus in duas partes æquales
per lineam CF: quæ quidem diuiſio hoc pacto fiet. Pe-
dem circini immobilem collocabimus in puncto C, &
cum mobili pede deſcribemus portionẽ circuli, quæ
ſecet in punctis G & H, duo latera DC & CE, quæ angu-
lum DCE continent: arcum autem GH diuidemus in
duas æquales partes in puncto I: & à puncto C ad pun
ctum I lineam rectam ducemus: ſicq́; linea CI diuidet
angulum DCE, in duas partes æquales, vt oſtendit no-
na propoſitio primi Euclidis: lineam autem CI pro-

10[Figure 10]

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79
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81	64
82	65
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