2P4 ^E MOTV TAVTOCHROXO 



§. 14. Antequam in effccliim grauitatis , qiio ifte 

 duplcx motu* retardetur , in^uiramus , inuclligcmus pertur- 

 batunicm motus ii vi quacunqiie follicifdutc oriundum. 

 Sollicitctur ergo pcndulum in puuvflo quopiam Z u vi 

 Z X — P , cuius dir.dij Z X et ad rtdam M Z nor- 

 ma'is , qnia vires obliqu.ie entcnus tantum niotum pendu- 

 li ntficiunt , quitenus pcr rclolntioncm pricbLUt vim ad 

 dirCLlionem M Z normalcm. Sit intcru.illum G Z ~ /^ 

 ac primo qiidem modus progrcdluus pcrinde allkictur , 

 ac 1] h;iec vis ZX ^ V in iplo ccniro grAuimtis efllt 

 appiicata ; quae ergo motum rcturd.ibit. Hinc cum maflii 

 corporis fit — M , pcr Icgcs foUiciiiitionis elt ; 



iidiLr^JiiJ - • -J pofito d t conftiuite. 

 Dcindc cum hni.is vis P momcntum fit rcfpe(flu motus 

 gyratorii — P /> , et mnmentum incrtiac corporis ~ M^^ 

 erit retardatio motus gyratorii : 



j_ddj> ~rh 



d i » — t\kk' 



§. 15. Hoc m">do vterque corporis motus afficcre 

 tur , fi corpns cflct iibcrum , ct ad omncs motus reci- 

 picndoi aeque compar.uum. Cum autcm ob fulpcnfionis 

 rationcm motus gyratorius pcrpctuo datam tencat ratio- 

 ncm ad raotum progrcfluium , hinc punclum Z dcfinic- 

 tur , in quo vim P applicari oportcat , vt vtriquc n otui 

 conuenicns immutatio fimul inducatur. Pcfitioncm vcro 

 huius pundi Z binac antc inucntac formulac ("1 ontc in- 

 dicant : cum enim ex iis hacc nalcatur analogia : 

 d(i(^:d {a-s)d<^ — h:kk 



■ i — _iidd^ » fc a d D 



Crit P: — d,(a — i)d$ — (a — Odd4)-dsd3>- 



Vndc 



