202 DE BAROMETRO , CJlVS SCALA 



merciirius in tiibo verticali C A vfque ad medinm ftdio- 

 ncm lK)ri7.ont:ilem tiibi A B , ct in tiibo \trtic.ili D E 

 vlqiic ad cius mcdiam (cdioncm , dum mcdia baromctri 

 altitudo obtinct , erit g h mcJia altitudo baromctri. 



6) Implcatur ctiam iiibus F E in F apcrtus mer- 

 curio. 



7) Cingatiir tubus ABCDE ct EF lamclla qua« 

 dr.itacxcifa mctallica MLKHGIM, ita At mcdia fcc- 

 tio lamcllac fi continuarctur , per axes tuNinim tranfnct , 

 et lirmctur ad cam. Latu^ fupcrius GIKH, fit calybc- 

 um longiusque oppofito Litcre , ita , vt partcs I ct K pro- 

 cumbant. 



8) Diuidntur H G in duas partes aequales , ct in 

 pun(fto diuilionis concipiatur linta pcrpcndicularis in H G. 



9) In quadam dilluitia in hac pci ptudiculari a li • 

 nea cxtcrma H G vcl I L fiat axis chalybtus immobilis. 

 e. g. propc N , vt tota machina inllar bilancis fiilpcndi 

 polUt. 



10) lugum chaiybeum pracdiclum GIKH fir tanti 

 ponderis, vt centrum grauitatis machinac a piniclo motus 

 N eam diftantiam habcat , quac rcquirirur , vt minima 

 ditTcrcntia pondcrum cx vtraquc paitc lincac N Q^ incli- 

 nationc lingulac prodatur. 



11) Propc G et H fiant obiccs , vt ne machina 

 lineam quidam a linea honzontaii rccukre pollit , fi cx 

 pundo C immobili rufpcnlii fit machina. 



12) Erigantur ct tirmentur ftili cylindrici chalybei a^ 

 et b d ita vt continuati conim axcs coincidant cum axi- 

 bus tuborum A C , D E , E F. 



Patct 



