Godine 1884. na vrh Riječkog lukobrana (nekad lukobrana Marije Terezije) postavljen je željezni svjetionik. Zbog slijeganja lukobrana, svjetionik je krajem 19. stoljeća premješten na Mlaku.Godine 1933. i treći put biva pomaknut, sada podignut uvis na trokatnu svjetioničarsku zgradu, i ojačan armiranim betonom. Zadnja promjena događa se 2002. kada se na zgradu nadograđuje još jedan kat za Obalnu radiopostaju.
Svjetionik se sastoji od osam prstena naslaganih jedan na drugoga. Na vrhu se nalazi lanterna s optičkim aparatom. Središnji dio optičkog aparata povezan je sa satnim mehanizmom. Svake dvije minute optički uređaj, koji se sastoji od osam leća, napravi puni krug, što znači da se svjetlost pojavljuje svakih 15 sekundi u obliku izmjeničnog pojavljivanja crvenog pa bijelog svjetla. Svjetlost je vidljiva s udaljenosti od oko 33 kilometra, odnosno 17,8 nautičkih milja. Svjetionik je danas u potpunosti automatiziran i uklopljen u vizuru grada.
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In 1884, an iron lighthouse was set up at the end the breakwater of Rijeka’s port (formerly breakwater of Maria Theresa). Due to the subsidence of the breakwater, the lighthouse was moved to Mlaka at the end of the 19th century. However, in 1933, it was moved for the third time and this time it was built as a four-storey lighthouse building as well as strengthened with reinforced concrete. The last change occurred in 2002, when the building gained another floor for the Coastal Radio Station.
The lighthouse consists of eight rings stacked on each other. At the top there is a lantern room with an optical apparatus, containing the lamp and the lenses. The central part of the apparatus is connected to a timer. Every two minutes, the optical apparatus, consisting of eight lenses, makes a full circle, which means that the light appears every 15 seconds in the form of an alternating occurrence of red and white light. The light is visible from a distance of approximately 33 kilometres or 17.8 nautical miles. Today, the lighthouse is fully automated and an integral part of the cityscape.
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