perpendiculum
perpendiculum
A plumb line, employed by ancient masons, bricklayers, etc.
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cum Aesculapio baculum, cum Archimede radium, cum Euphrate horoscopium, cum Perdice circinum, cum Vitruuio perpendiculum quaeque numquam inuestigare destiterit cum Thalete tempora, cum Atlante sidera, cum Zeto pondera, cum Chrysippo numeros, cum Euclide mensuras.
Praecipua tamen in hoc conveniunt, quod cum motus et apparentiae coelestes sint sphaericae, curvilineae, nobis vero terrarum incolis substrata sit facies horizontis plana, parietesque sint ad ejus perpendiculum erecti, corpora denique, quae manibus tractamus, aut planitiebus terminentur meris, aut mixtis saltem ex recto et curvo, instrumenta igitur nobis illa tractatu faciliora sunt, in quipus curvum in rectum est immutatum, cujusmodi sunt e primariis regulae circuli divisionibus exsculptae, quadrata geometrica dictae, astrolabia, et propter aedificiorum planos parietes, sciaterica, instrumentum usum obtinens latissime terra marique patentem, quo vix carere amplius humana vita protest.
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