motns nutem cjlibi ita Ht c "> r,parnriis , xt centriim iner- 

 ti.ic nioucatiir I cundum circjflionem IM K c.l'. ritare ~ v, 

 finuil vcro pyrctur circi axini qucn;cinquc- 1 () C-Icritue 

 angul.iri ~y, in cu n leulum, vt punifluin T ciici O 

 ii!Ccd.it pcr arculum T/, ac pro pofitione pundli O ftatm- 

 mus angulum P T O ~ et arcum T O — j-, vbi quidcni 

 nicus ira fumo, quafi radius globi cflct — i. Ducatur 

 TV ipfi PIR paraliela, ac fi motus gyratorius abeflct, 

 puniftum c(mta<ftu< T rafurum efTct planum horizontale cc- 

 leritate v in dircrtione T V. Dcinde fi globus folo mo- 

 tu gyratorio fcrrcrur , pundum T per Tt mouere- 

 tur ccleritatc fyfin. TOn /yfin j", cuius diredio cum 

 fjt hoiizontalis, in plano pcr rcc^am T0 rcfcratur, ita 

 vt fit anguius STOnPTf-^ — 90", ob O T / recftum. 

 Erit ergo V T 5 — 270° — ^. Capianrur retflac TV — v 

 et T0— /yfin. j, et quia piincftum T his duobus mo- 

 tibus coniuncftifn mouetur, cius verus morus fiet fecundum 

 re^ftam T F, diagondcm parallelogrammi T V F 0. Ex F 

 ad T V duifla normali FH, erit V H — /"y fin. j- fin. 

 et F H — — /y fin. s cof. ^, vnde fit F H - v — /y fin. s fin. 

 atque celeritas radcns 



T F = y (v V — zfti V fin. s fin.O 4- //y y fin. S') et 

 tang. V T F = _ -/^fin.scou 



Ducatur ex centro I ipfi T F parallela IQ, erit arcns TQ 

 quadrans, et angulus RTQrVTF; quare fi I Q fit di- 

 rc(fiioni, fecundum quam pundum T radit, parallela, erit 



tang. P T Q =: .^l^^lizil 

 ac pofita celeiitate radeute 



3 ^C"^'*' 



