Table 11. Standard error of unit weight of image coordinate measurements in 
qnicrons. 
  
  
  
  
  
  
Ee i | 
| Image Radii Filter | 
no ilotla'a!siceltis! | | 
20 87| 19| 20) 41 / 31 | 52] 19 | 65 | 
2 12-|10 | 23 61: |-48/| 42-154 | 97 | — | 520 mp | 
Averages| 24 | 19 | 22 | 51 | 40| 47| 82|80| | | 
  
  
Hence, after introducing parameters for the affinity in the adjust- 
ment the accuracy of the image coordinates in the films 1s of the same 
magnitude as in the plates. Also in films the standard error increases 
with the radii. 
4.222 Investigation of the variation of the affinity within some photo- 
graphs and between photographs in the same film roll 
In six photographs on film the affinity coefficients were computed. 
The photographs were located in different parts of the film roll. The 
results are demonstrated in Table 12. 
Table 12. Affinity coefficients expressed in units per thousand. 
Camera: R. C. 5 Aviogon. 
  
  
  
  
  
  
  
| image |: 0° — JR a dii 9 | Filter | 
Loue | 1 | 2 4 3 | 4 | 5 | @ | 7 | 5 | | 
| | | | | | | | | 
| fi | 080 | 046 | 052 | 0.54 | 044 | 049 | 042 | 040 | 520 mu | 
12 | 0.69 | 0.54 | 0.57 | 0.52 | 0.47 | 058 | 048 | 040 | 520 , | 
18 | 0.96 | 0.59 | 0.64 | 0.59 | 0.56 | 0.61 | 0.57 | 0.55 | orto | 
| 20 | 082 | 0.78 | 0.58 | 0.60 | 048 | 0.51 | 0.36 | 0.45 | | 
| 45 | 059 | 0.59 | 0.52 | 0.56 | 0.57 | 0.56 | | 088 | = 
| 16 | 0.83 | 059 | 0.66 | 0.63 | 0.56 | 0.56 | 0.61 | 0.47 | — 
  
Evidently the affinity coefficients are comparatively constant within 
each photograph and also between the photographs. 
4.223 The influence upon the accuracy of the photographs of differ- 
ent filters 
In Table 13, the results of the determinations of the standard error of 
unit weight of the image coordinate measurements in 9 photographs on 
film are demonstrated. The photographs were taken without filters 
(photographs number 5 and 20) and with some different filters. The 
computations were performed with seven parameters as demonstrated 
above 
40