BLE ntin 
C Base Object 
onvergence 6DmT 
Angle (2) Distance (Bj Distance (D) 
(m) (m) (mm) 
1 2 3 4 
o 1.1W 0.155W 0.0034 
. 1.2W 0.735W 0.0101 
© 1.3W 0.805W 0.0110 
— 1.4W 0.875W 0.0120 
1.5W 0.104W 0.0037 
0.1W 0.273W 0.0200 
0.2W 0.263W 0.0105 
0.3W 0.259W 0.0076 
0.4W 0.265W 0.0064 
0.5W 0.293W 0.0061 
© 0.6W 0.347W 0.0065 
© 0.7W 0.414W 0.0073 
QI 0.8W 0.485W 0.0082 
0.9W 0.556W 0.0091 
1.0W 0.626W 0.0101 
1.1W 0.696W 0.0111 
1.2W 0.766W 0.0122 
1.3W 0.835W 0.0131 
1.4W 0.904W 0.0142 
1.5W 0.973W 0.0152 
0.1W 0.254W 0.02080 
0.2W 0.245W 0.01110 
o 0.3W 0.248W 0.00830 
4 0.4W 0.271W 0.00740 
e 0.5W 0.314W 0.00741 
C» 0.6W 0.372W 0.00790 
0.7W 0.437W 0.00860 
0.8W 0.505W 0.00950 
0.9W 0.574W 0.01050 
T E n 
Convergence Base Object ÜDmT 
Distance (B) Distance (D) (mm) 
Angle (9) (m) (m) 
1 2 3 4 
1.0W 0.643W 0.01150 
© 1.1W 0.712W 0.01250 
© 1.2W 0.781W 0.01350 
co 1.3W 0.849W 0.01460 
1.4W 0.918W 0.01560 
1.5W 0.986W 0.01670 
0.1W 0.238W 0.0214 
0.2W 0.230W 0.0117 
0.3W 0.241W 0.0091 
0.4W 0.274W 0.0083 
Oo 0.5W 0.324W 0.0084 
. 0.6W 0.383W 0.0089 
e 0.7W 0.448W 0.0096 
v 0.8W 0.514W 0.0104 
0.9W 0.582W 0.0113 
1.0W 0.650W 0.0122 
14W 0.718W 0.0132 
1.2W 0.786W 0.0142 
1.3W 0.855W 0.0152 
1.4W 0.923W 0.0162 
1.5W 0.991W 0.0173 
  
  
  
  
  
RATIO FROM CW) OR CH) 
X10 1 
1 
12] 
10 
  
The optimum base distance 'B , the optimum object distance 
IABLE 2 
“D and the optimum theodolite elevation Éth at different 
values of convergence angle 
  
  
  
Convergence Optimum ; Optimum Optimum 
Base Distance | Object Distance| Theodolite 
Angle (9) : ; 
B D Elevation (Éth) 
(Degrees) (m) (m) (m) 
1 2 3 4 
5.0 1.3W 0.122W 0.50H 
10.0 1.1W 0.155W 0.51H 
20.0 0.5W 0.293W 0.51H 
30.0 0.4W 0.271W 0.50H 
40.0 0.4W 0.274W 0.50H 
  
  
  
  
  
THE CFTIMUM BASE DISTANCE 
—.— THE OPTIMUM OBJECT DISTANCE 
—— THE OPTIMUM THEODOLITE ELEVATION 
  
  
rig. 1. 
40 
mA 
15 $0 25 
30. 35 
CONVERGENCE ANGLE(DEG) 
60 45 50 
The curves give the expected ratios É/H , ‘B/W end 'D/W et 
convergence angle (8) for an object of width (W) end height (H) . 
   
   
    
     
    
    
     
    
    
    
  
   
    
   
  
       
    
   
    
      
     
      
    
    
Up N AN OF Spd pue RR A Ud pd a OU» 
I Nr ry a OT | Se ay Rm