electrodeless lamp

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Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

Click on image for enlargements of panel sections. The Ghent Altarpiece (open view) by Jan and Hubert van Eyck, 1432, polyptych with 12 panels, oil on panel; in the Cathedral of Saint-Bavon, Ghent, Belg.

The Most Stolen Work of Art

The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

Vincent Van Gogh, Self Portrait. Oil on canvas, 1887.

Rediscovered Artists: 6 Big Names That Time Almost Forgot

Andrew Jackson delivering a speech while on his way to Washington, D.C., for his inauguration in 1829. From Harper's Weekly, 1881.

5 Remarkably Close U.S. Presidential Elections

Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society

12 Novels Considered the “Greatest Book Ever Written”

Secret Service Agent Listens To Earpiece

Secret Service Code Names of 11 U.S. Presidents

electrodeless lamp

instrument

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spectral emission lines

In spectroscopy: Line sources
…are hollow cathode lamps and electrodeless lamps driven by microwave radiation. If specific atomic lines are desired, a small amount of the desired element is introduced in the discharge.
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