targ(^-0}zrV-'i/f^'; 



\ a ft o^ -^ 



Flnpfo aiitem tcmpore t zz -, — —- — r-r erit tang, (|)r '?;; 



i ef (a a -j- f f) . £ f Ca a -4- //) 



v-'-^^:-^:^'=r/y; 0-90' et 



j np. X — e f/ (g g -1-//) , — £ » Ca a -4- //) 



Corollariam 2, 



§. 27 Si nngulus DZO-f eflet =180°, eaedem 

 formulac motum indicabunt fumta cclcritate angulari y iie- 

 gatiua, feu motu gyratorio in contrarium verfo. At f\ fit 

 E — o, fcu globo lolus motus progrcliiuus fucrit imprefTus, 

 fit k—e, <^— 180% 1;— f-2(5g/; <p—o, X—t{e-Sgt), 

 Yz=:o, ^ =:: 1 80° •, rr 90° ^ y - ?4^' , et elaplo tempo- 



^^ ' — .5 g (a Q ^ //j "t 17 — a -». //' ** — TT^j-f Ct 



■V E f (q a -f- 2//) g g g g (g o -^. jj /) 



■^ — 3 taa ■+-//; +5 s to o -l-/77~ • 



Scholion. 



§. 27. Cafiis hic, quo globus initio nullum mo- 

 tum gyratorium e(l adeptus, in g. iiere valet, nequc ad 

 \llam hypothefin angulorum f et ^ ell adftridus. Tum 

 igitur globus m diredum progreditur motu progrcfliuo re- 

 tardato, motumque paullatim gyratorium accipier, donec 

 elapfo tempore t — -5 — —"- — --— niotum vniforniem ac- 



quifdt, quo deinceps coutmuo progrcdiatur. Hmc dcduci- 



mur 



