«43.1 ) xao ( 

 fcimiis f=~y hincque k — ^-^^; tum vero erit 



•y ^g c w co V » 6 g . 



k a a ' 



quoclrca tempus vnius vibratlonis erlt =: -_5_1.« ^ hjnc, 

 qae ipfe fonus a virga editus — 'i^i^i^C^. Denique cum fit 



^■^ _i_ e-"" r-f- r" 



cx priore autem valore, quo fmus w eft pofitiuus, erit 



— 77, 77~, — tt;-, mncque 



p — _ I ^^^^-tf^^ + ^ '^ ' ^ 



ita vt fit -r- zz — ^3-^"*^; altero antem cafu quofinus w eft 



negatiuus, reperitur — = -4- -^ == -H f"" ; quare fi fu- 



mamus a — r , erit (3 == T ^*^ , hincque y := i -4- ^ et 

 J — I ip ^*^ , vbi figna fuperiora valent, ft fin. co eft pofi- 

 tiuus, inferiora fi negatiuus. His igitur valoribus inuentis 

 aequatio pro motu \irgae perfeAe eft determinata, quae quo 

 fimplicius repraefentetur, notetur, ob /:=-^ effe -f = -^ ; 

 vnde fi ponatur breuitatis gratia ~-0i, vt fit j- i: ?/ oj , 

 hoc valore pofito aequatio noftra pro motu erit: 

 j-Cfin.(<?+f— /^)(^'*'T^"''""Mi±^'')fi"-«^+(*H-^'')c^"^) 

 ex qua ad quoduis tempus / ftatus virgac elafticac cogno- 

 fcitur, fi modo valor literae w rite fuerit definitus. 



Corol- 



