Images Dated 22nd August 2005

Nikola Tesla, Serb-US physicist

Nikola Tesla (1856-1943), Serb-US physicist and electrical engineer. Tesla was educated at Graz and Prague, but in 1884 he emigrated to the USA. For a while he worked with Edison, but soon left to work on his own. He developed the alternating current (a.c.) induction motor, and helped advance a.c. power generation and transmission. He also worked on high-frequency a.c. currents, inventing the Tesla Coil, a transformer in which the primary and secondary coils are in resonance. He used it to create electric sparks 40 metres long, and in 1899 lit 200 electric lamps over 25 miles without wires. The SI unit of magnetic flux density is named for him. Engraving from Discoveries and Inventions of the Nineteenth Century (1898)

© SCIENCE PHOTO LIBRARY

The Panathinaiko or Panathenaic Stadium (Kallimarmaron). Pan

The Panathinaiko or Panathenaic Stadium (Kallimarmaron). During Classical times the stadium had wooden seating. I was uset to host the athletic portion of the Panathenaic Games. Was Built in 330 BC by Lykourgos, and it was restored in its present form betwenn 1896 and 1906. Athens. Central Greece. Attica. Eruope

© Thaliastock / Mary Evans

USA, Hawaii Islands, Kauai, Scenic mountains and blue sky; Hanalei Valley, Wet taro farm

© Design Pics / Ron Dahlquist