Measurements in diapositives made from the same negative. 
Root mean square values of the residuals, microns. 
Table 2. 
Radius 
mm 
Camera 
Ag 38 
Ag 41 
Ag 38 
+ 
Ag 41 
Date 
29/6 
19/7 
12/8 
1/9 
29/6 
19/7 
1/9 
o 
3.3 
2. 1 
0.8 
1.6 
2.6 
1.8 
3.0 
2.4 
50.0 
2.3 
2.8 
1.3 
1.3 
1.3 
2. 1 
2.5 
2.0 
70.7 
1.6 
1.7 
1. 1 
1.8 
1.5 
3.2 
2.4 
2.0 
100.0 
4. 1 
2.3 
3.0 
2.5 
2.7 
2.8 
2. 1 
2.9 
111.8 
4.4 
3.4 
2.3 
3.2 
3. 0 
2.7 
1.9 
3. 1 
141.4 
6.5 
2.6 
3.3 
5.0 
3.9 
3. 6 
5. 7 
4. 6 
Radius 
mm 
Camera 
Ag 
196 
Ag 196 
. Ag 38+ Ag 4 1 
+ Ag 196 
Date 
29/6 
19/7 
12/8 
1/9 
0 
2.0 
2.8 
2.3 
2.6 
2.4 
2.4 
50.0 
1.7 
3.0 
2.8 
3. 1 
2. 7 
2.3 
70.7 
3.0 
2.4 
3.7 
3.4 
3.2 
2.5 
100.0 
2.3 
3.0 
4. 8 
4. 5 
3.8 
3.2 
111.8 
5.0 
5.0 
6.4 
4. 8 
5.3 
4.0 
141.4 
7.5 
6.3 > 
9.9 
8.4 
8. 1 
6. 2 
between two diapositives. In order to get the standard error of unit 
weight in one diapositive we have to divide by \J2. As a mean value 
of the standard error of unit weight in one diapositive we find about 
2.5 microns, which evidently indicates the highest possible accuracy 
to be expected. 
The diapositives from the camera Ag 196 show standard errors of 
unit weight which are significantly larger than those from the other 
two cameras. This probably depends on the lower quality of the film. 
Other investigations at the Oland test area do not indicate that the 
camera Ag 196 should be of lower quality than the cameras Ag 38 
and Ag 41. 
The individual residuals of the different points were calculated 
by the differential formulas and the root mean square values of the 
455