Word: lockyer
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Dates: during 1923-1923
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...inflammability, present in the air in minute quantity. Airships inflated with hydrogen or other gases are subject to the danger of being exploded by anti-aircraft guns or engine accidents; helium is immune to such catastrophes. Helium was first dis covered, in 1868, by Sir J. Norman Lockyer, the astronomer, by spectroscopic analysis, as one of the ingredients of the sun's chromosphere, or outer coat. For a long time it was supposed to be indigenous to the sun only, but in 1895 Sir William Ramsay (1852-1916), the brilliant British chemist, winner of the Nobel Prize...