Vitruvius Pollio, I dieci libri dell?architettura, 1567
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                  per la debolezza del capo, la uertigine. </s>
                  <s id="s.006479">Similmente i gradi, che uanno ſu la tribuna di detto
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                  Tempio hanno i loro piani piegati in entro, perche ſe uno diſcendendo cadeſſe, hauendo il calca­
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                  gno piu baſſo, che la punta del piede, fuſſe forzato a dare in dietro, & non cadere inanzi. </s>
                  <s id="s.006480">Bel­
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                  le ſono anche le ſcale di alcuni moderni. </s>
                  <s id="s.006481">come ſi uede nel mirabile palazzo d'Vrbino, & anche
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                  in Roma le ſcale del palazzo. </s>
                  <s id="s.006482">& altroue, che ci portano molto lume, & ci fanno molto auuer­
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                  titi. </s>
                  <s id="s.006483">Hora quanto appartiene a Vitr. dico, che egli uuole, che dalla ſquadra ſi prenda la miſu­
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                  ra della ſcala. </s>
                  <s id="s.006484">Imperoche dal ſolaro al piano, per linea perpendicolare uuole, che lo ſpatio ſia
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                  diuiſo in tre parti, & di doue cade il piombo ſi tiri una linea in fuori, che ſia diuiſa m quattro
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                  parti eguali ciaſcuna a ciaſcuna delle tre. </s>
                  <s id="s.006485">Se adunque dall'altro capo del piano, ſarà tirata una
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                  Linea alta ſommit à della perpendicolare, che ſia di cinque parti, allhora compartendoſi i gradi ſo
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                  pra quella, ſarà la ſcala commoda, & proportionata, come ci moſtra la figura. </s>
                  <s id="s.006486">Delle ſcale a
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                  lumaca doueria ſimilmente Vitr. hauerne ragionato, ſe qui fuſſe ſtato il luogo ſuo. </s>
                  <s id="s.006487">Ma quello,
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                  che egli ha detto delle ſcale è ſtato per occaſione, & per dimoſtrare, l'uſo della ſquadra; & ſe be
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                  ne altroue non ne ha detto, non però ci ha laſciato ſenza occaſione di potere da noi trouare il mo
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                  do di farle. </s>
                  <s id="s.006488">Conuengono le ſcale dritte con le torte nella miſura, & commodità de i gradi: con­
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                  uengono nelle apriture, & in altre coſe, ma queſta è la differenza, che il fuſto delle ſcale dritte,
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                  che è detto, Scapo, da Vitr. è una linea dritta, che dalla ſommità al piano diſcende, come hipo­
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                  tenuſa, o diagonale: ma il fuſto delle ſcale a lumaca è dritto a piombo, & d'intorno a quello, co­
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                  me ad un perno ſono i gradi, benche anche ſifacciano le lumache ſenza fuſto. </s>
                  <s id="s.006489">Queſte ſcale erano
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                  fatte da gli antichi per ſalire a luoghi altißimi, come ſono colonne, piramidi, & altri grandiſſi­
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                  mi ed ficij. </s>
                  <s id="s.006490">Lapianta delle lumache è come una uoluta, la eleuatione ſi fa da certi punti della
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                  uoluta. </s>
                  <s id="s.006491">però Alberto Durero ce la inſegna nel primo libro della ſua Geometria. </s>
                  <s id="s.006492">Noi hauemo meſ­
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                  ſo la figura, & la proſpettiua, inſieme con le ſopradette dimoſtrationi.
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                  Come ſi poſſa conoſcer una portione d'argento meſ­
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                  colata con l'oro finita l'opera. </s>
                  <s id="s.006494">Cap. III.
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                  <s id="s.006495">Esſendo ſtate molte, & merauiglioſe inuentioni quelle di Archimede, di tutte
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                  con infinita ſolertia, quella, che io eſponciò, pare, che troppo ſia ſtata
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                  eſpreſſa. </s>
                  <s id="s.006496">Imperoche Ierone nobilitato della regia poteſtà nella città di Sira­
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                  cuſa, eſſendogli le coſe proſperamente ſucceſſe, & hauendo deliberato di por
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                  re al Tempio una corona d'oro uotiua, & di conſecrarla a i Dei immortali, per grandiſ­
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                  ſimo pretio la diede a fare, dando a colui, che ſi preſe il carico di farla, a peſo la quantità
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                  dell'oro. </s>
                  <s id="s.006497">Queſti al tempo debito approuò al Re l'opera ſottilmente fatta con le mani,
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                  & parue che al giuſto peſo dell'oro reſtituiſſe la corona. </s>
                  <s id="s.006498">Ma poi, che fu inditiato, che
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                  leuatone una quantità di oro, altrettanto di argento in quella poſto haueſſe, Ierone ſde­
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                  gnato di eſſere ſtato sbeffato, nè potendo hauere la ragione, con che egli ſcopriſſe il fur­
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                  to, pregò Archimede, che prender uoleſſe la cura di riconoſcere il fatto, penſandoui
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                  molto ben ſopra. </s>
                  <s id="s.006499">Hauendoſi Archimede allhora preſo il penſiero di queſto, per caſo en
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                  trò in un bagno. </s>
                  <s id="s.006500">Et iui nel ſoglio diſceſo gli uenne ueduto, che quanto del corpo ſuo
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                  ci entraua dentro, tanto di acqua fuori del ſoglio ne uſciua. </s>
                  <s id="s.006501">per il che hauendo ritrouato
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                  la ragione di potere dimoſtrare la propoſta, non dimorò punto, ma uicito con grande al
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                  legrezza del ſoglio, & andando ignudo uerſo caſa, dimoſtraua ad alta uoce d'hauere ritro
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                  uato quello, che egli cercaua, perche correndo tutta uia gridaua in Greco. </s>
                  <s id="s.006502">Eurica, Eu­
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                  rica, cioè io ho trouato, io ho trouato. </s>
                  <s id="s.006503">Dapoi che egli hebbe l'ingreſſo di quella inuentio
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                  ne, fece due maſſe di peſo eguale ciaſcuna alla corona, delle quali una era d'oro, l'altra
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                  di argento, & hauendo queſto fatto, empì fin all'orlo d'acqua un ampio uaſo, & prima ui </s>
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