Encyclopedia > ESR

  Article Content


This is a disambiguation page; that is, one that just points to other pages that might otherwise have the same name. If you followed a link here, you might want to go back and fix that link to point to the appropriate specific page.

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
Flash (photo)

... of magnesium powder that was ignited by hand. Later, the magnesium were contained in flash bulbs, and were electrically ignited by a contact in the camera shutter. A bulb ...