i^z DE BJROMETRO, CVirS SCALA 



tu mixiiomi aeris ciim mcrciuio ; qua ntione etiam 

 firiclio tiintum non ccfllirc vidctur , cui prior machina 

 obnoxi;i cr.it. Potcl^ ctium mflchin;\ hacc commode ex 

 vno loco in aliud tran>tcrri , fi apcitura tubi ab chuditur 

 et vas D E fcmper altiorcm locum obtinet quam cylin- 

 drus A B. 



§. 13. Confidcratio inrtnimcnti . quod fig. 3. cxlu- 

 bctur occafioncm dcdit conltrucndac iibrac baromctricac. 

 Putaui fi cffici polTit , vt tubus A B axi cuidam firmo 

 '^E- 3 incumbcret , ct circa iilum mobilis cflct , intcr vas D E 

 et tubum A B potcntia quaedam e. g. in G adplicarctur, 

 quac acquilibrium ficcrct tubo B D in horizontalcm fitum 

 reducto, qiiantitatcm mcrcurii cx A B in Nas DE flucn 

 tis ct qu.uititatcm cx va(c D E in vas A B rcccdcntis jx:r 

 potcntiam quandam in G adplicatam , vcl cx potcntia in G 

 adplicata fubdudam dcfiniri poflTc. Apparcbat , fi tiibus 

 A B nmplus fici-ct ct vas D E paritcr amplum et infignis 

 capacitatis , quantitatcm mcrcurii prcfllonc atmofpliacrac 

 aucla in vai D li flucntis tubo in hori/ontali fitu conlcr 

 vato inngncm cflc poflc , (pcr §-9), ct hinc ]X)tcntiam 

 in G infigncm rcquiri quac pondus mcrcurii in D E il- 

 lapfi , fullcntct. Apparcbat fimul , quo propinc]uius G 

 cylindro A B affumcrctiir , co maiorcm potcntiam rcquiri 

 ad pondus mcrcurii in D E flucntis fuftcntandum ct tu- 

 bum in hori/.ontali fitu conlcruandum ; co maiorcm vc 

 ro ctiam potcntiam contra axin dirccflam cffc , ct hinc 

 affiiiflum in machina augcri dcbcrc potcntia in G crcfccntc, ct 

 fic cucntum votis minus rcfpondcntcm pracdici. His confide- 

 ratis ct in fublidium ^ocatis iis, quac §. 9 pracmifli , inci- 

 di in conflrudioncm quam non dubitaui commu- 



nicarc. 



