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

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1oculo ad centrum applicato perpendiculum
indè ſuſpenſum cadere parallelum perpendi­
culo, quod ex extremâ diametro pendet, &
conſtituere angulum cum diametro æqua­
lem illi, quem cum eâdem diametro facit
perpendiculum ex eius extremitate ſuſpen­
ſum.
Quare ſola centri altitudo ſupra terræ
ſuperficiem, aſſumenda eſt tanquam oculi
obſeruatoris altitudo.
Guld. Vel ſi minùs placeat perpendiculo
vti, Quadrantis latus horizontaliter iacens
duplicetur, & in extremâ diametro fiat cen­
trum, circa quod conuerſa dioptra tantiſper
eleuetur, dum linea fiduciæ congruat radio
optico terram tangenti; nam ſemiſsis anguli
ad centrum facti cum latere horizontaliter
iacente inſiſtentis eidem arcui, eſt angulus
depreſsionis infra horizontem, æqualis an­
gulo ACD facto in centro terræ; cuius com­
plementum eſt quæſitus angulus CAD.
Gal. An non operæ pretium facturus eſ­
ſet, qui illud demum in praxim deduceret,
quod ego olim aliud neſcio quid meditans
perficiendum iuſsi, ſed aliis curis diſtractus
ad exitum non perduxi?
Duxeram in plano
verticali lineam horizontalem longam pe­
des Rom. ferè quinquaginta, & in eius ex­
tremo puncto, quod eam cæli plagam re-

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