Galvanic corrosion is a process that degrades metals electrochemically. This corrosion occurs when two dissimilar metals are located in contact with each other in the presence of an electrolyte, such as salt water, forming a galvanic cell.
But the memories of that tragic day 25 years ago are still vivid to many in Edmond. On Aug. 20, 1986, gunman Patrick Henry Sherrill shot and killed 14 co-workers, wounded six and then took his own life inside the post office where he worked.
The Ottoman Ministry of Post was established in Istanbul on 23 October 1840. The first post office was the Postahane-i Amire near the courtyard of the Yeni Mosque. In 1876 the first international mailing network between Istanbul and the lands beyond the vast Ottoman Empire was established.