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Show '308 Cép. 2:. Be Vola' tn 0 H) M I\1\‘.\‘l‘.|\‘l1l.l '10; XL, BORELLI p R o p o s. CLXXXXV. 309 Sit Auis RS in acre fufpcnfa , qux vcmrc prono alas BEA , & BCF expanfas rctlneat, Sc prim?) it ven(momodo impulfus obliqui tranfuerfales , direaé m t0 pcrpendicularlcer ad horizontcm afccndcnte percutiantur earum fucies pronee BEA , & BCF tanta vi , pcllere poll‘unt corpora , ad motum indiffeVt delapfus auls impediatur . Dico , quod impellctur rentia . Tab. :3. Fig.3. horizontali motu ab S verfus R . Qtya duce alarum.) Confiat ex mechanicis o quod acfio cunei ABC, virgae offeaz BC , BE vi mufculorum , 8: ob carum duqua duae partes EFG, & LMN, eiufdem corporislcin. riticm refifiere pofl'unt impulfui venti , 85 proindé rc- di , 85 ab inuicem feparari debent,efi translatio corpo. tinerc polTunt camdcm dilatatiouem , at tOta latitude rum refificntium DF , 8: HM fuper inclinatasfupcrfi- flabelll cuiuslibet aloe ccdit impulfui venti, cum pcnme cies cunei CA,& CB: fuper quas coguntur afcenderc, flexiblles rotare poflint circa. manubriagvcl axes oflcos dum cuncus infinuatur per direéfionem axis ab I ver- BC, 8c BE; 8: ideo neceffc ell, vt penuarum extremisus C . Vcrum idem motus tranfuerfalis ad parresop tates A, 8?. F ad inuicem approximentur 5 quapmptcr pofitas fuper eafdcm filperficics inclinatas CA, &CB alas formam cunei acquircnt , cuius acles tcndet verfierl debet, fl collateraliacorpora DF, Sc HM nitanmr shsA, F - Tales autcm cunei facics comprimuntur fe conflringere , tunc cnim cuueus lzeuis, 8c lubricus vrrimque 2‘: venro afccndcntc . Ergo 3* nccclfe cfl: , Vt ABC motu contrarlo cogitur difFugerc, 8c retrocedra. cuneus exprimatur , cxpellaturquc versus bafim eius re 51 C yerfus I , expulfus nempé é compreflio‘ne col- CBE: cumquc talis cunfzus alarum promoueri non.) laterallum corporum , non {ccus , ac nuclei lubrici polfitanifi fccum raplar fibi annexum corpus auis RS comprcfl'is digitis longiits cxpclluntur ; fitquetalisex. inaerc natanris , 8: idco amoulbilis é fuo loco, prolnpulfio tanta vi , & impetu , quantum corpora compri- déquc cedere potcfiloc111n aeri aduem‘cnti a vcnto im. montla DF, Sc HM filis momentis firingunt planainclmata CA 3 & CB : qua: momenta ad carum vircsab- aEx Scllol. DE MOTV ANIMALIVM. folutas a camdcm proportionem habcnt, quam pla- "99- 63- uorum AI, & BI altitudlnes ad longitudines AC JBC huzus . Cap. 2 2. Dc Vela. m. 3 Prop, antes. B I VlONl MOSEV""‘ shs R . l s l Supponatur modo aer fubieétus in quietc conflitu- H133 qui pcrcutiatur :‘z flabellis alannmmotu pcrpcndu f pellente . Igitur auls horizontali motu excurret vet-- CIllari ad horizontem . Quja perindc‘: vcla, 85 flabella.» alarum cuncl fox-mam acquirunt, acie versus caudamo P R O P O S. CLXXXXVI. cellllerfa, <35 vim , 8: comprcflioncm camdem ab aerc Si Auis in Aere fufpenfie alae expanfie aerem {able- Pltiuutur , flue alae vibratae aercm fubiefium l'cagran: fium qulefcemem pcrcufl'crint moru perpendiculari rem validé percutianr , (inc 6‘: contra alae cxpanfie, fixc mcllnationum eorumdem . 3d hOI'IZOIltf-‘ma excurrct auis tranfuC-rfalimotu pl' rftentis ofl‘eis manubrij53percuflionem vcnti afccndcno rallclo plano horizontis. Tab.13. Fig.2. CC"riseXdl'iants 8c in vtroque cafu pcnna: flexlb‘iilcs uut |
