Contour 



20*0**^"' 



^-x 



Template "Orthogonal" Line 



Tangent to Mid- l^ Vcj 

 Contour -v.,,^ 



\.\ 



^^^'^lWc,-°l^l^— — ^- 





Incoming Orttiogonal 



urning Point 



Template 'Orttiogonol " Line 



Incoming Orttiogonol 



NOTE: Ttie templote has been turned obout R until the value '/p = 1.045 



intersects the tangent to the midcontour. The template "orthogonal" line 

 lies in the direction of the turned orthogonal. This direction is to be laid 

 off at some point B"on the incoming orthogonal, which is equidistant 

 from the two contours along the incoming ond outgoing orthogonols. 



Figure 2-20. Use of the refraction template. 



2-69 



