272 13 E VIB R AT lONI B V S 



§. 15. Si porro ponntiir Ion:itiido bg vcl 

 X' =: o , opoitct \t fit - t;uig. Aic. ^- ^ — O , vnde 

 oritur - (j --z z q vel == 4 ^ vcl -~ 6 q ctc. atque 

 L — ' X ve! rr \ A vel n: \ X, qiiiie proprictas con- 

 vjiiit vtique cljordnc finipi.ci cg longitudiiiis X fixae 

 in pundis g et c. Scd fi ponatur X — o oportet 



tnni?. Arc '^^ q 

 vt lit — ■ — TT—f— — — o , luic tnng. Arc. p ^r o, 



vnde nunc ^ ^ zr a </, vel — 4 ^, vcl — 69 etc. at- 

 quc L' — .!X' vcl =z:|X' vei — i X' , quae proprietas 

 competit nunc chordac fimplici bg longituduus X' 

 fixae in punctis g ct b, 



%. \6. QuoJ fi practcrea ponatur p ~ {) tunc 

 ambae chordac b g qx. c g vnaiii candcmque con- 

 llitucnt chordim b c atquc erit ctiain L — L' : ac- 

 quatio autem noflra fimplicitcr mutabitur in hanc 



— tang. Arc. \ q — tang. Arc. - q , quac nunc indicat 

 cfle fummani arcuum ^^4-^^—27 vcl — ^ q 

 Tcl ~ 6 q ctc. Ergo L fiuc V erit zz ^^- vel 



— '^rtJ: vcl — ^^ etc. haec autem proprictas 

 competit chordac bc vniformitcr crafHic atque fixae 

 in pundis b ct c. Omnia hacc corollaria pcr fe 

 obuia i}-fi rci naturac perfcdc conucniunt ^ fimul 

 flutem ab ac,]uatioiic nofira , fi debito moJo trade- 

 tur , obtimc indicantur. 



§. 17- Pro^rcdior ad cnfiis , qui intcgrum 

 pofiuhuu calculum numcricum acquatione nofira in- 



dica- 



