164 
sible. These tests were obtained by the I.G-.N. according to two different ways of 
adjustment (the first one mechanical-graphic and the other analytical) of the measures 
obtained with the same instrument. Therefore the calculations of M m , a m and m A 
were also executed for test 11. 
On the whole the calculations described in paragraph 2 were executed for 15 of 
the 20 tests. 
Taking into account the principles of choice shown before, the diameter D has 
390- 
660 670 680 690 700 710 720 730 740 750 
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Fig. 30 
720 730 740 750 760 
been chosen to be 16 km long. This is a little less than the width of two adjacent 
strips. 
In this way, the average number of control points contained in the circles is 
about 9. 
For the computation of the means and of the differences, we suppressed (besides 
the points with an error higher than 60 m in the coordinates) the 14 points already 
enumerated in paragraph n° 3, chapter VI A), since they had been recognized 
as anomalous for non photogrammetric reasons. However, for these points, we 
computed both the mean M and the difference A.