DALEN, GUSTAF 7) , Swedish inventor, was born at Stenstorp Nov. 3o, 1869. After passing his examination as an engineer at Goteborg in 1896 he completed his studies at Zurich. On his return home he invented hot-air turbines, milking and other machines. In 1906 he became chief engineer to the Gas Accumu lator Co., which was exploiting in Sweden the French invention of dissolved acetylene. In 1909 he was appointed managing di rector of this company and then succeeded in composing a prod uct called "Agamassan" which has the property of absorbing acetylene without any danger of explosion. Dalen's cleverest in vention was what is called Solventil, which when placed in a fire kindles it automatically when twilight sets in and extinguishes it at daybreak. In 1912 he was awarded the Nobel Prize for physics. During an experiment in 1913 he became blind in consequence of an explosion, but nevertheless he continued to conduct his ex periments until his death at Stockholm Dec. 9,