ORENBVRGI INSTITVTAE. 187 



inter figna in prima obferuatione erat ^\ ped. in 

 fecunda 2I ped. in tertia 4. ped. ac denique in quar- 

 ta diftantia fignorum erat 5 pedum. 



III. 



Verificatio quadrantis. 



I. Ad horizontem. 



Ekdis in aedificio per 35oo circiter pedes 

 remoto duobus fignis , ope folidae menfulae efficie- 

 bat , Yt in fitu inuerfo quadrantis , aeque ac in re- 

 dlo , medietas \itri obiediui in eadem foret altitu- 

 dine. 



Altitudinem primi obiedi in fitu redo quadran- 

 tis reperiebat o°.4o'— oRev. 82 p.c. — 0°. 38'. 2^', 5 

 Ct inuerfo quadrante o°4o' + oRev. 49^:1^0. 41. 11,0 



DifFerentia o. 3. 8, 5 



vnde error quadrantis concluditur 4- i. 34, 2 



Altitudinem alterius obiedi in fitu redo quadran- 



tis inueniebat 0°. 40'+ i Rev. 2 3.p.c.:i:o°. 42.'. 56'^,3. 



in fitu inuerfo o. 40 +2Rev. 55. p.c.nio. 4.6. 6,9. 



Hinc differentia o. 3. lOj^. 

 ac error qnadrantis reperitur + i. 35, 3. 



II. Ad Zenith. 



Limbo orientem fpedante altitudinem meri- 

 dianam ftellae y\ ^rfae maioris inueniebat 89° — 

 7Rev,8i.p.c.rz: / 88°.4i^ 2o",S. 



A a 2 Limbo 



