Nils Gustaf Dalén won the 1912 Nobel Prize in Physics for automatic regulators used with lighthouse gas burners.
Dalén developed automatic systems that controlled the supply of gas to lighthouse lamps. His inventions included the Sun valve, which switched lights on at dusk and off at dawn, and devices that made flashing lighthouse signals economical and reliable.
These systems reduced fuel consumption and allowed unattended lighthouses to operate for long periods. Dalén’s work was especially valuable for maritime safety because clearly timed light signals helped ships identify particular coastal locations.
Dalén suffered severe injuries and lost his sight in a laboratory explosion in 1912, the year he received the Nobel Prize. The award recognized his practical engineering advances in automatic regulators for illuminating lighthouses and light buoys, rather than a discovery about astronomy or navigation itself.