Clavius, Christoph, Geometria practica

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11Vrbis cuiuſ-
uis
, ac regio-
nis
ſit{us} quo
pacto
deſcri-
batur
.
6. Qvod ſi intra ſitum propoſitum duoloca, vel vnus ſaltem non exiſtat,
vnde
omnes anguli conſpici poſsint, vt in omnibus ædificijs contingit, oporte-
bit
ſitum circumire, &
inueſtigare angulos per rectas, quæ in campo à baculo ad
baculum
ducendæ ſunt per catenulam ferream, vel chordam, aut certe erigen-
111[Figure 111] dum planum, quod per binos baculos tranſire conſpiciatur.
Ipſum enim planum dictas rectas exhibebit. In ædificijs au-
tem
, ac templisipſi muriexteriores dictos angulos conſtitu-
unt
, quorum amplitudo inueſtigari ſolet ab artificibus inſtru-
mento
quodam ex duabus regulis compacto, quarum vna
ſub
alteram ingreſſa moueatur, (quod Italis Squadrazoppa
dicitur
) vt hæc figura indicat.
Aperto namque inſtrumento,
ſi
crura duobus muris angulum effi cientibus congruent, da-
buntinteriora
crurium latera in cõcurſu angulum quæſitum.

Et
ſi idem inſtrumentum interioribus angulis ædificiorum applicetur, dabunt
eadem
latera interiora crurium angulos, qui à muris effi ciuntur.
Inuentis angu-
lis
, ac notatis, menſuranda erunt interualla inter baculos in campo erectos, vel
inter
angulos ædificiorum, per catenulam ferream, vel chordã, aut certe in cam-
pis
, ſi ea interualla longa ſint, per problema 2.
vel 36. exploranda in aliqua men-
ſura
nota, vtin cubitis.
Nam ſi in charta ducatur linea OP, tot particulas æqua-
les
continens, quot cubiti, verbi gratia, in interuallo AB, deprehenſi ſunt, &
an-
gulus
POS, angulo BAE, inuento fiat æqualis:
& in recta O S, accipiantur tot
particulæ
prioribus æquales vſq;
ad S, quot cubiti in interuallo AE, repertiſunt:
acrurſum
angulus OSR, angulo AED, æqualis fiat, &
ſic deinceps, repræſenta-
bitur
ſitus campi per figuram O P Q R S.
Idemque de ſitu ædificiorum
tam
exteriori, quam interiori intelligendum eſt, ſi diligenter anguli, ac diſtantię
obſeruentur
.

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