As soon as radiography was discovered, one looked forward on applications to see through objects, that is to say: -either, to see an object behind another one which is considered as a mask. -or, to observe an internal part of an object. But it is surprising to observe that it took a long time to overcome this purely visual attitude and to consider radiography as a tool very well suited to description of a tridimensional object. Two kinds of reasons for that can be stated: i/the first one, purely mental, is due to the difficulty to overcome certain limits more or less formed in the brain coming from human senses. ii/ the second one is due to certain separation, at a certain period of time, between engineers` and physicists' knowledge and the mathematicians' knowledge.
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