16 
The maximum errors found in the experiment with the Conto- 
nar - Galileo camera were probably caused by the variation in 
the distortion curve in the depth of field (this camera has a 
distortion curve with maximum variations in the order of 
+ 0, 1 mm). |f we were to repeat the calculations, and apply 
a program of correction of the distortion referred to above, 
we think the results would be better. 
As regards the experiments relating to the Wild P/31 ca- 
mera, the results obtained using the monocomperator and using 
the Stereocartograph are on average comparable. 
Taking into account all of what has been said, and having 
ascertained the possibility of doing certain surveying opera- 
tions by means of photogrammetric methods, it is also necessa 
ry to plan a rational and industrial organisation of the survey 
work, in particular in cases where it must be done frequently. 
In other words, we must plan the organisation of a comple 
te operating system in which the various operations of 
- marking the object to be examined, 
- positioning the object in a system with known and stable con 
trol-points, 
- and making the photogram stereo-pairs 
constitute a series of operations that can be carried out accu 
rately and quickly, without however creating problems or in 
any way impeding other possible operations of a different type. 
The successive operations of developing and checking the 
plates, reading co-ordinate points, processing the data elec- 
tronically, and subsequently applying the analytical data (for 
example for drawings etc.) can all also be done "off-line". 
The concept that we wish to stress here is that the pro- 
cess of photogrammetric surveying must be as internal as possi 
ble to the industrial cycle that requires it. 
There is no doubt that "industrial photogrammetry" has wi 
" 
de application and has its own multiform reality; in this brief : 
pa 
va 
bl 
wh 
po 
us 
al 
st