SEC. vn

De motu Cireulari Fluidorum:.

Hypothefis.

Efiftentiam, que oritur ex: defe&u lubricitatis' partium Fluidi,A Cceteris parıbus, proportionalem effe velotitati, qua partes Fluidi

feparantur ab invicem.-

* Prop. LI. Theor. XXXVIL,

Si Cylindrus folidus infinite longus in fluido uniformi<> infinito circaaxem pofitione datum uniformi cum motu revolvatur,& ab hujus imput-{u[olo agatur Fluidum in Orbem, perfeveret autem fluidi pars unaquaque -unıformiter in motw Wo; dico quod tempora«periodica partium fluidi funt,ut ipfarum dıflantie ab axe cylindri, 7

Sit AF L cylindrus unifor-miter circa axem S in orbemactus,& circulis concentri-cas BGM, CHN, DIO,EK P,&c. diftinguatur flui-dum in orbes cylindricos in-numeros concentricos foli-|£ 5 1‘dos ejufdem craffitudinis. Et 444quoniam homogeneum eft 5% 43Fluidum, imprefliones conti-guorum orbium in fe mutuofacte, erunt'( per Hypothe-fin) ut/eorum tranflationes ab invicem& fuperficies contiguz in+quibus imprefliones fiunt, Si impreffio in Orbem aliqguem major

) En eft