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.
According to the United States Post Office archive, the first known appointment of a woman to carry mail was on April 3, 1845, when Postmaster General Cave Johnson appointed Sarah Black to carry the mail between Charlestown Md P.O. & the Rail Road . . . daily or as often as requisite at $48 per annum.