42» METHODrS OBSERJUNm 



capillis hoc modo extcnfis aptetiir in foco tubi ita , vt 

 pro liibitii circumucrti poiHt cum omni liflemate c.ipillo. 

 rum. Kt coulhuc^a crit muchina ad phiifcs Luminarium, 

 chordaH]ue defcduins , et pofitioncs chordarum ad le ia 

 \iccm diurnosviue Luminarium ab vnico oblcruatore eo- 

 dem momcnto accuratc oblcruandas rcquifita. 



§. 2. Priusquam ad modum cclipfcs Luminarium pct 

 machiuam hanc oblcruandas cxponcndum ■.icccd:im , con- 

 venit prius dcfcriberc methodum , qua dilluitiac capillorum 

 illorum parallelorum in partibus circuli maximi absque 

 mcnliiratione .dillantiac in Tcrrac fupcrficic nirumcnd.ic , 

 obreru.uioncquc Ikllamra deteiTTiinari poflint : lcilicct : 

 mcnrurcntur rcpititis vicibus . circino malori , radii trium 

 vel quatuor circulorum concentricorum iii limbo quadrantis, 

 in cuius foco capiiii hi aptati llint , ducflorum , ct npcr- 

 turac circini pro quolibct radio fnftac appliccntur fcorfim 

 ad fcalam in p;irrcs acqualcs cxadiilimt; duiif.irH , ct nu- 

 mcrus partium lcalac vnicuiquc radio rclpondcns fcorfim 

 notctur. Dcindc ciigatur infpicicndo pcr tubum quadian- 

 tis nota aliqua difiinc^a in acdificiis vrbis , ^cl alibi in Tcrrac 

 fupcrlicic fita , ad camquc , pofKo quadrantc ct capillo 

 G C iu fitu exadlc verticali , dirigatur capillus B D ita 

 "vt e.indcm pcr tubum quadrantis Mlam cxadc tcgat , vcl 

 Hringat. Notcntur in hoc fitu quadranti? atramcnto , vcl 

 alio quocunquc colorc , pcnna vcl pcnicillo , cxccpto , 

 punda pcriftriarum in limbo (juadrantib dudarum mcn- 

 furitorum radiorum , in (iuibu.e capiilus cum pondulculo e 

 ccntro qnadr.mris lilx:rc fuljxnftis casdcm fccat. His fiim - 

 ma ciicumlpcclionc pcra<ftis dirigatur ad candcm notani iri 



codcm 



