Nils Dalén, in full Nils Gustaf Dalén, (born Nov. 30, 1869, Stenstorp, Swed.—died Dec. 9, 1937, Stockholm), Swedish engineer who won the Nobel Prize for Physics in 1912 for his invention of the automatic sun valve, or Solventil, which regulates a gaslight source by the action of sunlight...
Mary Salome Cutler Fairchild, née Mary Salome Cutler, (born June 21, 1855, Dalton, Mass., U.S.—died Dec. 20, 1921, Takoma Park, Md.), American librarian, a central figure in the establishment and teaching of the field of library science in the United States. Salome Cutler graduated from Mount...