Mifitttanta Curhfi. 3 31 



fought ; which Elevations are therefore had by 

 ding and fubtrafling the half Difference to and 

 from the aforefaid half Sum, 



1 (hall not need to Ipeak of the Facility of 

 ifeefe Solutions, I (hall only obfenrc that they are 

 both General, without Exception or Caution, 

 and derived from the Knowledge that thefe two 

 Elevation? are equidrftant above and below the 

 Line, bife&ing the Angle between the Objecl 

 and the %enitb. 



A 



