37 
x 
Y tO'mn 
Fig. 1. 82:4. Residuals in the glass plate negative after 
adjustment and correction of regular errors. 
Number of 
Fig. 1.82:5. Histogram and normal distribution curve of residual 
image coordinate errors in X-ray photographs after 
calibration. 
Average 
So' 1CT 3 mm 
Fig. 1. 82:6. Weight distribution of image coordinates in X-ray 
photographs. Glass plate negatives.