AERIS IN TVBIS. 413 



S O 1 U t 1 O. 



Extcndatirr pullus ptimo excitatns per fpatiunl 

 AD, ct iii loco quocunque T pofito int runl'o 

 AT — S, fuerit denfitas acris rrQ^ naturali cxiftcnte 

 — B, ctleritas vcro — T fecuadum dir-di.Micn^ AB 

 hiiic coi ftruatur primo curua A M D fumendo ap- 

 pl.catas TMnS/^, quae ergo vltra D in ipfum 

 axem D B incidit. Deinde conftruatur etinm curua 

 A N F lumeado appl:catas T N = sT^±_L'ijis ^ ^.^-^j^ 



quidem primum membrum in D vbi T ~ o eua- 

 nefcit , altcrum verOcATa^S ibi certum valorem 

 adipifcctur , cui (equtntes applicatae omnes verlus B 

 crunc aequales , iti vt haec fcala A N F vltra F 

 abeat m recflam F G ipfi axi A B parallelam j at 

 arca huius curuac ita definictur vt fit A T N zz - 



c 



/Tfl^S: vnde cum pundlo T in D promoto fiat 

 applicata DF — •fT dS, crit area ADF^ADDF 

 pcriiide ac fi tota fcala A N F G cfT-t rcda G F ipfi 

 axi paralleh et fupra vcrtictm A vsque continuata. 

 His pofitis primo qnaeritur quomodo has fcalas\Itra 

 A coiitinuari oportcat, vbi ante omnia eft obfcruan- 

 dum aercm in ipfo vcrtice A nullum plane mntum 

 concipere poffe. Qiiare fi tubi puudum S , in quo 

 fupr:\ gcneratim cclentatcm » definiuimMS , in A 

 transf.ramus, formula ib. pro celeritate exhibita 

 y--l(m-TM+TMr«)+,-fs(ATM Atm-ATN-Atn) 



hoc ciifu nulla effe dcbtt. At hoc cafu habcbimus 



Szro, quia in hac formuia pofuimus AS— S, ex 



quo neceffe eft contmuationcm quaefitam ita cfTc 



F t f 3 com- 



