POSITION SCALE 1 INCH = 15 CENTIMETERS 
  
  
  
  
  
» C + Bb + &t * ® * + vtt + 
vg uk tie Wo uui tue v + + ++ + 
> ts d OF +) hy Cie ne og 
* + + 
a uo + + | 
* ^to» VR d Y X i ^ 4 
fb 1 MILLIMETER 
Figure 10. Error Vectors in A Displacement-Free Test 
No. of (1) (2) (1) (2) (3) (4) 
Experiment Check Points d. Oy d, o, dr o. 
1 26 „044 J. ow . 66 .05 A3 
2 . 38 .040 .068 .006 .057 .04 .09 
3 47 .034 .076 -.028 .062 .04 „10 
4 18 „007 ‚063 -.028 .058 .03 .09 
Mean .03 .08 -.009 .06 .04 .10 
(1) d, dy means of x and y components of error vectors 
(2) Ok» Oy Std. deviation of x and y components of error vectors 
= 2 2,4 
(3) d, = (d. * d, ) 
- 2 2,4 
(4) =, = (e^ tef) 
Table 1. Error Vectors Computed From Four Experiments 
20