Tartaglia, Niccolo, Quesiti et inventioni diverse, 1554

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                <s id="s.000567">QVESITO DECIMOTERTIO FATTO DAL
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                medeſimo Signor Prior di
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                Barletta.
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                <s id="s.000568">PRIORE. H
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                ierſera uoi dimoſtraſti con buone ragioni di quanta longhezza ſe
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                potria con ragione determinare che doueſſe eſſer la longhezza della canna d'un
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                pezzo di Artegliaria ad eſſere debitamente proportionata alla conueniente miſura
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                della poluere, & balla che ſi coſtuma à dare à un tal pezzo, la qual miſura conueniente
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                il ſe ſuppone che ſia li dui terzi di quello che peſa la balla. </s>
                <s id="s.000569">Hor ſe il fuſſe uno pezzo
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                (poniamo uno canon da. </s>
                <s id="s.000570">20.) che per ſorte haueſſe quella ſua debita & proportiona­
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                ta longhezza che ui ſi conuiene alli dui terzi poluere di quello peſa la balla, che gli deſ
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                ſe poi piu poluere, cioe piu delli detti dui terzi di quello che peſa la balla, ue adimando
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                ſe tal pezzo tirara piu del ſolito.
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                N. S
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                enza dubbio che lui tirara alquanto piu delſo
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                lito.
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                P. Q
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                uesto ſaria contra alle ragioni da uoi hierſera adutte, perche in queſto caſo
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                la balla ſara uſcita della bocca del pezzo auanti che tutta la detta poluere ſia compita di
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                riſoluerſi in fuoco, e pero quella parte de uigore, che ſara cauſato da quella tal parte de
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                poluere di piu, dapoi che ſara uſcita la balla della bocca del pezzo ſara fruſta è uana,
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                e pero tal pezzo non doueria tirar piu, per tal poluer dataui de piu (reſtando il uigor
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                di quella in tutto uano è fruſto) anci doueria tirare ſolamente ſecondo il ſolito.
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                N.
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                Q
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                uel uigore uentoſo, che generara quella parte di poluer dataui de piu (dapoi che la
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                balla ſara uſcita dalla bocca del pezzo) à benche lui non potra operare nella detta balla
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                mentre che quella ſara dentro della canna del pezzo, il non reſtara pero da operare
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                in quella, dapoi che ſara uſcita dalla bocca del pezzo, cioe in aere, perche tutto quel
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                uento che uien cauſato dalla poluere nella detta canna ſempre ſeguita per alquanto uni­
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                tamente la balla, anchor che la balla ſia uſcita per alquanto fuora della bocca del pez­
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                zo, e pero ui augumenta alquanto il moto, uero è che tal uigor uentoſo non operara
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                tanto nel ſpingere la detta balla (per trouarla coſi fuora della detta canna) come faria
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                ſe la trouaſſe dentro nella canna, cioe che tal ſuo operare non ſara proportionale à
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                quella quantita di poluere poſtaui di piu, anei ſara molto lontano di tal proportione.
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                P. I
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                o non intendo queſto operar poportionale.
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                N. O
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                perar proportionale ſe in­
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                tende in queſto modo, poniamo eſſempi gratia che queſto noſtro canon da lire uenti, ti­
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                randolo à una data elleuatione con li dui terzi poluere di quello peſa la balla, tiri paſſa
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                1000. tirandolo poi con tanta poluere quanto peſa la balla, la qual poluere ueneria à
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                eſſere un tanto è meggio di quello era prima (cioe dalli dui terzi) hor dico, che ſe que­
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                ſta poluere che ui fuſſe aggionta de piu operaſſe proportionalmente nella balla, tal
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                pezzo doueria lirare alla medeſima elleuatione preciſamente paſſa. </s>
                <s id="s.000571">1500. cioe un tan
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                to è meggio di quello fece con li dui terzi poluere. </s>
                <s id="s.000572">Et io dico, che il pezzo in ſimil ca­
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                ſo non ſolamente il non tiraria li detti paſſa. </s>
                <s id="s.000573">500. de piu, ma forſi che il non tiraria
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                manco la mita di piu, cioe paſſa. </s>
                <s id="s.000574">250. Ma ſupponemo che lui tiraſſe li detti paſſa.
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                <s id="s.000575">250. de piu (che in ſumma ſaria paſſa. </s>
                <s id="s.000576">1250.) Anchora dico, che tiraſſe il me­
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                deſimo canone con uno altro terzo di poluere de piu, cioe con tanta poluere quan­
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                to peſa la balla, & un terzo piu, che ſaria quattro terzi queſto ſecondo terzo non </s>
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