Adelsnäs (formerly known as Näs) manor was named after Johan Adelswärd, who acquired the local copper mine in 1781. The present manor building was built Theodor Adelswärd in 1916-1920. English garden and parks around the Bysjön lake are popular when open to the public.
The unique detail is a “Sun Cannon”, which is installed in a red brick tower from 1853. It is a 6-pound cannon from the same period with an ignition system consisting of a magnifying glass mounted on a movable arm, adjustable to the sun’s different meridian latitudes. At exactly 1 pm, when the sun reaches its highest point at midday in summertime, the sun shines through this opening, hitting the magnifying glass focused on the priming compound at the back of the cannon.
References:The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.