Ask the Chatbot Games & Quizzes ProCon History & Society Science & Tech Biographies Animals & Nature Geography & Travel Arts & Culture Money Videos
Julius Elster
Directory
References
Discover
Santa Claus flying in his sleigh, christmas, reindeer
Was Santa Claus a Real Person?
Diverse elementary school children wearing school uniforms running outside of school. Boys girls
Pro and Con: School Uniforms
Title: Senate Square, St. Petersburg, December 14, 1825: repression of the troop mutiny - watercolor by Carl Ivanovitch Kollman, 1825 depicts Decembrist uprising clashing with cavalry, with spectators watching. (new style December 26, 1825) Europe. Saint
8 of the Largest Empires in History
Rural Irish landscape, Sligo, Ireland.
Why Is Ireland Two Countries?
Woman tied to a ducking stool, a method of punishment by means of humiliation, beating, or death. (cucking stool)
8 Unusual Punishments Inflicted on Women Throughout History
An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.
11 Egyptian Gods and Goddesses
A human Inuit skull in a stone chambered cairn in Ilulissat in Greenland. These ancient graves are pre christian and are at least 2000
14 Tough Questions Answered

Julius Elster

German physicist

Learn about this topic in these articles:

development of thermionic devices

  • Schematic of a basic thermionic converter.
    In thermionic power converter: Development of thermionic devices

    From 1882 to 1889, Julius Elster and Hans Geitel of Germany developed a sealed device containing two electrodes, one of which could be heated while the other one was cooled. They discovered that, at fairly low temperatures, electric current flows with little resistance if the hot electrode is positively…

    Read More