E30oQgti 



monftrac Opcica > dum per colle&ionem radiorum Solis res 

 combuftibiles accendic, five haec colle&io fiaeper fpecula five 

 per vkra (phaerice elaboraca. Quapropcer propofuum chsto- 

 rema pro indubicato habeo, & pro principio dcmonftracionis 

 affumo» 



THEO%EMA H. 



Promanifeftohabeo,quod duo radiilblares ad idem (pa- 

 cium cadences in duplo majorem producancefFeftunrb quam 

 fi unus cancum cadac, fimilicer in criplci majorem producenc 

 calorem > fi cres cadanc radii ad idemlpacium , quam fi unus 

 tancum cadac* Denique univerfalicercaloremproporciona- 

 licer ad copiam vel paucicacem radiorum in idem fpacium ca- 

 dencium incendiauc remicci pro indubicaco habeo. 



THEOREMA III I 



Caufa ejusdemenergiae,&eodem modo difpofica femper 

 codem modo, & xquc mukum operacun,. 



Hispraemiffis ad demonftracionem progredion pro qua 

 incelligenda, vide Figuram III. 



N.i. Siclinea horizoncalis LK> hujus medium fic pun&um 



C x circa^uod defcriprus fit circulus verticalis LBAK. 



Pun&um A Zenich, & centrum Solis ibidem exiftens, 



B cencrumSoIisexcraZenichexiftencis. 

 N.2. Conne&ancur AC, & quia ABL eft quadrans cir- 



cuIi>idcircofiencanguli ACG & ACH re&i. 

 N.3. Conne&antur B & C, & quia B eft excraZenith> 



idcirco arcus BL eft quadrante minor, adeoque an- 



gulus BCZ fiecacucus. :; 

 N.4. acencroSoIis A elevecur (per Prop.ILlib. I.EiicIid.) 



perpendicularis AM adiplam AC, icem ab eodem 

 f pun£lo ft elevecur verfus alceram parcemperpendi- 



cularis AN adeandem AC, qux perpendiculares 



fcca- 



