Ceva, Giovanni, Geometria motus, 1692

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              SPIEGATIONE
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              di vna nuoua ſpecie di Baleſtra.
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              Tab.
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              9.</s>
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              <s id="s.000862">IN queſta figura ſi eſprime vna nuoua
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                tione</expan>
              di Baleſtra, la quale, maſſimamente
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              in grande, per tirar granate, ò ſaſſi può eſ­
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              ſere di gran conſeguenze nella militare, co­
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              me dimoſtreraſſi. </s>
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              <s id="s.000863">Dalle ſue parti ſi verrà in cognitione del
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              modo di fabbricarta, e ſono le ſeguenti. </s>
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              <s id="s.000864">AM, MN ſono amendue le braccia. </s>
              <s id="s.000865">Il punto M è il cen­
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              tro della machina. </s>
              <s id="s.000866">Per la cauità M deue paſlar la pallą
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              ſcagliata dalla corda; e per di ſotto M ſi ferma & incaſtra
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              nel manico, al modo delle baleſtre communi. </s>
              <s id="s.000867">Ai due capi,
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              ò ſiano eſtremità A, N ſi annette la fune. </s>
              <s id="s.000868">I punti A, E, F,
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              G, I, K ſono in vna linea retta. </s>
              <s id="s.000869">Gl' interualli AE, EF, FG,
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              GI, IK, ſono, benche non di neceſſità, eguali. </s>
              <s id="s.000870">Le altezze,
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              ò commeſſure KL, IH, GD, FC, EB perpendiculari, nell'
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              incuruarſi dell' arco, ſi aprono intorno a' centri K, I, G, F,
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              E. </s>
              <s id="s.000871">Donde ne ſiegue, che prendendo la corda dal ſuo mez­
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              zo, e tirandola verſo O; amendue le braccia ſi aprono nel­
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              le predette commeſſure, come compare nell' vno d'eſſi ſe­
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              gnato a punti con le lettere corriſpondenti. </s>
              <s id="s.000872">Ciaſcuna
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              delle predette commeſſure viene ſtrettamente rinſerratą
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              da vna molla, come ſi vede in L, H, D, C, B; e queſte mol­
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              le, quanto più ſi auuicinano al centro M, deuono eſſere più
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              grandi e più maſſiccie, in modo che, per cagione della
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                dezza</expan>
              opportuna, vengano ad aprirſi con egual facilità
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              dell'altre, e per cagione della groſſezza, habbiano nel ſer­
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              rarſi maggior forza, ò ſia momento, per la ragione, che ſot­
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              to ſi dirà. </s>
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            <p type="main">
              <s id="s.000873">Ciò preſuppoſto, è facil coſa dimoſtrare i vantaggi di </s>
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