X 30 )( 



in acrem calefKfliim largior , qiuim in :ili:i corpora , non 

 vidcbatur , fcd radii a viiporibus intcr vitni ciuilhcn ct fo- 

 lcm lucrcntibus intcrcipi vidcb:\ntnr. Qiio autcm quili'- 

 bct iudic.irc polfit , qn.uuum oblcru.uionibus eiusmodi fit 

 tribucndum ; hinc aliiuii iuiit viiuii , (i ciusmodi experimcntis 

 calorum veram dcrtnirct rationcm , ita , vt cxpcrimcnta 

 rcpetcrct , caquc alia inllitucrct ratione. Si ad oblcrua- 

 tioncs attcndit , p.uct , radios dircdos cum radiis rdradis 

 commodc comp:\rari non pofTc ; C\ autcm liccret com- 

 pararc ; a) Crclccntc cfficacia radiorum dirc(florum , cre- 

 fcere etiam debcret conftaiucr cflicacia radiorum rcfracflo- 

 rum , et contra. b) Eidcm gradui a radiis dircdis pro- 

 ducto fcmpcr idcm gnidus a rcfractis produdlus rcfpondcre 

 dcbcrct , ct cidcm gnului a radiis rcfraiflis produclo idcm gra- 

 dus a nidiis dirccftis producflus. Ex liis app.u-ct , quo- 

 modo de cllicacia caloris in (ccflionc coni radiautis a Icn- 

 tc producli iudic:uidum fit \ ct quomodo ratio denfitatigi,^ 

 radiorum lciitc rcfi-acflonim ad dcnftratcm nujionini di- 

 rccl:.»rum dcfiniri dcbcat. Qiio autcm AudKir pouuMinis 

 impcdimcnris obuiam irct , ct diucrl-is nidiorum , in di- 

 ucrfis (patiis collciftorum , clficacias compararc valcrct , 

 oblcniat, non p:iniin fonc ficcrc , (i diias lcntcs , (imilcs 

 ct acqualcs , eligcrct , ct in diucr(is a foco didantiis in 

 Ytriuscjuc coni nuii.intis axc Thcrmomctri bulbum collo- 

 caret , qua rationc obtincrctur : a) Tantum radiorum in- 

 tcrcipi ab vna icntec^ qiiaiuum ab altcra. b) Tot nidi- 

 os pciictrare pcr vnam lcutcm , quot pcnctrant pcr alte- 

 ram c) Pcr idcm t-^-mpus in Auius Thcrmomctri bul- 

 bum cfikaciim fuam cxcrcrc radios (()larcs , pcr c]iiod 

 cxcrunt in altcrius Thcrmomctri bulbum. d) Dcn(itatcs 



radio- 



