Casati, Paolo, Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae

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1diculum cadat vltra ſemiſſem lineæ AB;
demptus autem ex gr. 30. ſi cadat citrà ſe­
miſſem, dabit angulum diſtantiæ à vertice
quæſitum. Quod ſi diſtantia à vertice exceſ­
ſerit gr. 60 perpendiculum cadet extrà latus
BE; idcirco ſuſpendendum èrit ex I puncto,
quod bifariam diuidit rectam AE; & ſiqui­
dem obiectum in Horizonte fuerit, perpen­
diculum ex I cadet in B, ſi verò ſupra Hori­
zontem, cadet in latus AB, ſi demum infra
lineam Horizonti parallelam depreſſum fue­
rit, cadet perpendiculum in latus BE: ſem­
per autem in noteſcet angulus factus à perpen­
diculo & lineâ FI visûs, dantur enim vel la­
tera IA & AB, vel IE & EB cum angulo
comprehenſo: vel ſaltem in vtroque latere
deſignari poterit punctum, in quod ad rectos
angulos cadit linea ex I.
XXXVIII
Vſus Tri­
goni æqui­
lateri ad
obſeruandos
angulos, in
quo vix er­
rari poſsit à
Geometra.
Vt verò in quàm minimas particulas di­
uiſam haberet rectam AB, iubebam duci
AC æqualem vni ex ijs partibus, in quas pri­
mò diſtinctam eam poſuimus, nempe iņ
vncias pedis, & perfici parallelogrammum
ABDC. Tum diuisâ AC, & BD in quinque
æquales partes, & ductis parallelis ipſi AB,
inter poſtremas a d & CD ducatur diagona­
li; C d; & diuiſis pariter ſingulis vncijs iņ
quinque partes, vt factum hìc eſt in vnciâ

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