Defectoscope (Descrydefect) is intended to detect internal defects in welds (pores, cracks, slag inclusions, and others.), in metals and some plastics. The device allows to determine the depth at which the defect is in the range 7 ... 50 mm with accuracy ± 1 mm.
The first defectoscopes (Descrydefect), which worked on the continuous sounds, created by S. Y. Falcons in 1928. In 1937-1938, there was the world's first defectoscope (Descrydefect), which used alternating current control structures of railway and wheel sets.
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Industrial Engineering defectoscope:

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