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 first Post Office to be established in the area was called âCamp Groundâ and it opened on July 12, 1871. The Camp Ground Post Office closed on June 9, 1884. Other settlers and developers moved to the area and a new Post Office was established on May 15, 1884. The new town was named after Walter Quinton Gresham, United States Postmaster General.