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The article offers information about the photoelastic tomography wherein it is considered as a nondestructive way of calculating three-dimensional (3D) stress fields. There are also important features of the photoelastic tomography in linear approximation including the determination of the stress field is decomposed to the measurement of a single stress component at a time. These measurements were taken through an automatic polariscope. The article also presents an approximation of the precision of the measurements.

Thomas Johann Seebeck, an Estonian-German physicist, chemist and physician was born in 1770 in Tallinn, Estonia. Educated in Tallinn, Berlin and Göttingen, he lived and worked in Jena, Bayreuth, Nuremberg and Berlin, where he died in 1831. In this article, his main scientific achievements in optics and electricity are briefly described, his life story is summarized and the genealogy of his ancestors is given. [ABSTRACT FROM AUTHOR]

The article features the life and works of physicist Thomas Johann Seebeck. He is one of the most known scientists born and grown up in Estonia. His discoveries in photoelasticity and thermoelectricity has a worldwide impact to engineering and technology. In relation to this, the opening of the memorial board of Thomas Johann Seebeck that took place in Tallinn on May 11, 2007 has been highlighted.