Fun facts!? The Swedish inventor Gustaf Dalén (1869-1937) invented many revolutionary systems for beacon lightning for lighthouses [1]. In Sweden those lightho

Fun facts!? The Swedish inventor Gustaf Dalén (1869-1937) invented many revolutionary systems for beacon lightning for lighthouses [1]. In Sweden those lighthouses was called "AGA-fyr" (AGA-lighthouse) after his company AGA and abroad Dalén-lights. Some of the inventions was the: - "Dalén Flasher" that made the beacon flash and that conserved 90% of the acetylene gas, and the timing between flashes also made so observers could differentiate between beacons. - "Dalén Mixer" that gave lighthouses greater luminosity where acetylene and oxygen was mixed in specific proportions. - "Sun valve" made so the lighthouse only was on during the night to preserve gas. It was a black body rod that was connected to a membrane and tree shiny rods. So when the sun shined, the black expanded and turned off the gas. When the Blockhusudden beacon in Stockholm, the first sun valve beacon in the world, was electrified in 1980, it was discovered that the sun valve had never needed to be repaired! For this, he also got the Nobel Prize in Physics 1912 “for his invention of automatic regulators for use in conjunction with gas accumulators for illuminating lighthouses and buoys.” [1] https://www.tekniskamuseet.se/en/learn-more/swedish-inventors/gustaf-dalen/ https://www.tekniskamuseet.se/en/learn-more/swedish-inventor...