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a BAL iil 
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c x A € ae rri iet a i s dé intl - 
nici stunt - wi oii dion o Ac didi iun ach bia 
     
   
  
   
   
   
   
     
      
  
   
  
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dt 4- E dl; (Ix) 
dy = - dik Bi; (ly) 
S S = 
where s = Vx2 4 (g + y)2. (1s) 
The formulae (1x, ly, 1s) correspond to the coordinate system of 
the figure. If coordinates are recorded in the instrument system, where 
the direction of the Y-axis 1s reversed, the formulae are: 
ness Y X | 
dX = E Sg dt + S dl; (2x) 
: X ex : 
dY = + S dt — ES dl; (2y) 
S AH fg Yy (25) 
s