Nils Gustaf Dalén was a Swedish engineer and inventor who received the Nobel Prize in Physics in 1912 "for his invention of automatic regulators for use in conjunction with gas accumulators for illuminating lighthouses and buoys." The Nobel Prize in Physics 1912, announced November 12, 1912. Gustaf Dalén, “for his invention of automatic regulators for use in conjunction with gas accumulators for illuminating lighthouses and buoys”. Gustaf Dalén: born 1869, Stenstorp, Sweden. Wiki link Data: the Nobel Foundation (CC0).