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arcula per centrum datum progre-dietur.

-Etenim quändo per planum volva-tur conus, ejus basis describit circu-lum, cujus femidiameter aequalis estlateri coni illius. Coni autem vertexstat immotus , fitque praefati circu-li centrum. Rota: e £ ?rp sunt intraduos conos , quorum bases sunt rota:7rp e C S£ vertex punctum -h Quodautem coni isosceli perplanum rota-ti circulum describant, & verticesimmotos habeant, hinc manifestumest quod dum jacet conus in plano, su-pra unum ex suis lateribus quiescens,a:qualiter utrinque libratur, idque obeam caulam, quia in duas partes aequa-les apiano dividitur,quod ab horizon-te elevatur ad angulos rectos; sic im-pulsus externa vi vertitur semicircu-lorum unusquisque qui sunt in fiiper-sicie ab eodem latere, & alios medioscirculos eorumdem circulorum im-pellit, sic que sit. motus. Si igitur con-cipiamus animo esse semicirculos us-que ad verticem; in eo vertice neque *semicirculus relinquitur, neque aliudspatium. Unde cum vis movens nonhabeat quod impellat ab oppositis par-tibus, non potest circulari motu ver-ticem movere, nisi forte eum in des-tinatum quemdam locum impelleret.

Progressio arcula: per parallelo -grammum hoc modo fiet. Sit ar-cula a ß y cf, in ea sit axis z £ cumadjunctis sibi rotis qua: sint f/6 % A:tertia autem rota sit p y , quarum

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