Tartaglia, Niccolo, Quesiti et inventioni diverse, 1554

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                <s id="s.001176">
                  <pb pagenum="55" xlink:href="042/01/109.jpg"/>
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                & una fra Ponente, & Oſtro, & una fra Oſtro, & Leuante. </s>
                <s id="s.001177">Anchora cadauna di que
                  <lb/>
                ſte quattro parti ſe diuide pur in due parti eguali, & quella diuiſione che fra Leuan­
                  <lb/>
                te, & Tramontana, ui ſeſcriue Grego, & à quella che è fra Tramontana, e Ponente,
                  <lb/>
                ui ſe ſcriue Maiſtro, & à quella che é fra Ponente, & Ostro, ui ſe ſcriue Gar­
                  <lb/>
                bino. </s>
                <s id="s.001178">Et à quella, che è fra Oſtro, e Leuante, ui ſe ſcriue Sirocco, & coſi la cir­
                  <lb/>
                conferentia di tal primo cerchio uenira à eſſer diuiſa in otto parti eguali, & cadaun­
                  <lb/>
                di quelle diuiſioni ſe chiama uento, e pero tal circonferentia ſera diuiſa in otto uenti,
                  <lb/>
                & cadauno de quelli ſi chiama, come di ſopra è ſtato detto, nondimeno per abbreuia­
                  <lb/>
                ſcrittura in luoco di Leuante, ui ſe ſcriue un.
                  <emph.end type="italics"/>
                L.
                  <emph type="italics"/>
                et in luoco di Ponente, ui ſe ſcriue un.
                  <emph.end type="italics"/>
                P.
                  <lb/>
                  <emph type="italics"/>
                & in luoco di Tramontana, ui ſe ſcriue un.
                  <emph.end type="italics"/>
                T.
                  <emph type="italics"/>
                & in luoco di Oſtro, ui ſe ſcriue un.
                  <emph.end type="italics"/>
                O.
                  <lb/>
                  <emph type="italics"/>
                & in luoco di Grego, uiſe ſcriue un.
                  <emph.end type="italics"/>
                G.
                  <emph type="italics"/>
                & in luoco di Garbino, uiſe ſcriue un'altro.
                  <emph.end type="italics"/>
                G.
                  <lb/>
                  <emph type="italics"/>
                & in luoco di Maiſtro, ui ſe ſcriue un.
                  <emph.end type="italics"/>
                M.
                  <emph type="italics"/>
                & in luoco de Sirocco, ui ſe ſcriue un.
                  <emph.end type="italics"/>
                S.
                  <emph type="italics"/>
                co­
                  <lb/>
                me di ſotto nella figura appare. </s>
                <s id="s.001179">Anchora ſe diuide cadauna di quelle ottaue parti di det
                  <lb/>
                ta circonſerentia, primamente in tre partieguali, & cadauna di quelle terze parti ſe
                  <lb/>
                diuide anchora in altre tre partieguali, & cadauna di queste ultime parti (eſſendo lo
                  <lb/>
                detto tondo di lamma, di competente grandezza) ſi debbono ultimamente diuidere in
                  <lb/>
                tinque parti eguali, il che facendo ſe trouara tutta la circonferentia del detto primo ce
                  <gap/>
                  <lb/>
                chio eſſer diuiſa in.360.parti eguali (ſecondo l'ordine, & diuiſione delli antichi cho­
                  <lb/>
                  <gap/>
                ographi) & cadauna di queſte tal partiſe chiama grado, & accio che tai diuiſioni, ſia
                  <lb/>
                no apparente ſe ſegnano cadauna con una linceta long a una meggia coſta di cortello, et
                  <lb/>
                queſte tai lineete (accio che tutte tendano al centro di tal cerchio) ſe deſcriuono con
                  <lb/>
                unaregagiuſtando talrega con il centro di tal cerchio, & con il ponto di quella diuiſio
                  <lb/>
                ne che ſi uol ſignare nella detta circonferentia, & accio che tai diuiſioni ſi poſſano con
                  <lb/>
                facilita numer are (occorrendo il biſogno) à ogni cinque de tai diuiſioni piccole ui ſe ſa
                  <lb/>
                una diuiſiont che trauerſi tutto quel ſpacio che è fra la circonferentia del detto primo
                  <lb/>
                cerchio, & la circonferentia del ſecondo. </s>
                <s id="s.001180">Ma ſe per caſo il ſopradetto tondo di lamma,
                  <lb/>
                fuſſe talmente piccolo, che quelle ultime terze partinon fuſſeno atte, per la ſua picco­
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                lezza, à eſſer diuiſe nelle ſopradette cinque parti eguali, ſe laſſariano ſtar coſi, per il­
                  <lb/>
                che la circonferentia del detto primo cerchio ueneria à eſſer diuiſa ſolamente in.72.
                  <lb/>
                partieguali, onde facendo tai.72.parti, apparente con il tirarui quella lineeta per fi­
                  <lb/>
                na alla circonſerentia del menor cerchio ſecondo l'ordine detto diſopra, cioe che tutte
                  <lb/>
                le dette lineete
                  <expan abbr="tendanõ">tendanon</expan>
                al centro delli detti cerchij, ſi come appare nella figura ſotto­
                  <lb/>
                ſcritta, ma biſognanotare che ſi ben la circonferentia di tallamma, per la ſua piccoleæ
                  <lb/>
                za, ſara diuiſaſolamente nelle ſopradette.72.partieguali, come nella detta ſottoſcrita
                  <lb/>
                figura appare, nondimeno tutta la detta circonferentia con lo intelletto ſe debbe inten­
                  <lb/>
                dere eſſer diuiſa pur nelle dette.360.partieguali, cioe in.360.gradi, & pero nel com­
                  <lb/>
                putar le ſottoſcritte.72.diuiſioni, per cadauna di quelle, ui ſe computa cinque gradi,
                  <lb/>
                perche.5.fia.72.uien à fare li detti.360.gradi, & dapoi che ſe haueran fatte tutte
                  <lb/>
                queſte coſe, ouer diuiſioni, ui ſe debbe far aſſaldare una armilla della medeſima ſorte di
                  <lb/>
                banda di ottone, ouer di rame à torno al centro, cioe uno cerchio della detta banda lar­
                  <lb/>
                ga almen dul dedi, qual uenghi affare à modo di una ſcatolina à torno al detto centro
                  <lb/>
                della detta prima lamma circolare, talmente che ſia concentrica con quella, & nel cen-</s>
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