Paris Pantheon in 1851. The machine that made its appearance in 2005 in the South Courtyard of Gdansk University of Technology is a 64 kg metal disc suspended on a 26m arm. The movement of the pendulum is easy to follow because of a laser beam. An electromagnet fixed at the point of suspension powers the movement of the pendulum that would have otherwise stopped. Reliefs in the window niches above the Foucault pendulum show Johannes Hevelius, a design of a reflective sundial (on the left) and a rotating map of the sky with a sextant. These stainless steel reliefs have been made by Robert Kaja. A relief of a well-known Gdańsk resident D.G. Fahrenheit was unveiled in the North Courtyard in October 2013. Fahrenheit was a physicist, engineer, inventor and the creator of a mercury thermometer temperature scale. There are two portraits of the great physicist. The first can be found in a window niche. The other is covered with a thick glass pane. Its upper section looks like a network of blood vessels, while the blue-tinted section at the bottom shows crystal-like structures that can often be seen on glass when temperature is lower than 0 °C or 32 °F. In the middle there is an image of a Fahrenheit thermometer. The historic gas meters While the university buildings were being completed in 1904 the mains gas supply was installed at the same time. The internal gas distribution system started at the porter's lodge with the main valve and the gas meters fitted in a purpose designed cabinet located nearby. The permanent exhibition of the Gdańsk University of Technology historic water powered gas meters that remain on their original site shows the well-preserved fragments of the original system. Gatehouses at the main entrance gate The gatehouses are two small lodges in front of the main building positioned symmetrically along the main axis. On the eastern side there is a porter's lodge (with an image of a key) and a cottage which officially belonged to the head electrician (with a flower image, it was more likely to be a gardener's house). After modernisation the structures became the headquarters of the Promotion Office and the main reception. Two lions placed on the balconies of both houses The lion on the eastern side holds the coat of arms of the city of Gdańsk. Owl Sculpture There is a rebuilt life-size image