use mercury in temperature measuring devices (previously alcohol was used) and developed his own scale of 0 to 212 degrees. Hevelius and Fahrenheit, the two distinguished physicists who are considered as representatives of Polish science, have their own places of rembrance at Gdańsk University of Technology. By virtue of the Resolution of the Senate, the Courtyards in the Main Building of Gdańsk University of Technology have been named after the two scientists. Both of them have been commemorated with reliefs that have been designed by the scientists of Gdańsk University of Technology with the help of genetic algorithms and a specially designed computer application running on Gdańsk Tech's supercomputer. Historic places The main building, designed by Hermann Eggertt and Albert Carsten, was built between 1900 and 1904 and constructed at the same time as the Electro-Technical Institute, Machine Laboratory and the Chemical Institute. All the buildings were designed in the style of the Northern Renaissance with the elements of Art Nouveau. Several stone images that decorate the front represent in symbols the purpose of the building. The Medusa head above the main entrance protects the building against intruders and signifies energy. The images above the eastern side gate are a lighthouse and the tower of St. Mary's Church, while those over the western gate are a partially damaged likeness of a steam engine and a bow of a ship. Portraits of Prussian scientists and pioneers of the 19th-century engineering are to be found above the windows of the upper ground floor – the architect Karl Friedrich Schinkel, physicist Gotthilf H. L. Hagen, a manufacturer of steam engines Johann F. A. Borsig and a naval architect Ferdinand Schichau. The ornamental gutters are decorated with copper spouts in the shape of four male figures holding water monsters. The Clock Tower destroyed in 1945 was restored to the roof of the main building on the 13th of May 2012. The tower is 18m high, weighs 15 tons and is crowned with a gilded image of the Allegory of Science. The main building encloses inner courtyards covered by glass domes designed by W. Czabański and Z. Wilk and installed in 2004. In 2012 the South Courtyard was officially renamed in honour of Johannes Hevelius. The Foucault pendulum is designed to show the rotation of the Earth on its axis. It is named after the French physicist who first performed a similar experiment at the