SOS Established – International Distress Code Designated Today in 1906

S O S – Ships in distress shall use the following signal repeated at brief intervals:…—… The 1906 International Wireless Telegraph Convention established the signal as the call for a ship in distress and was incrementally adopted after the agreement was approved in 1908. This 1935 book on the early history of the S O S signal used by ships in distress is held in the collection.  SOS To The Rescue by Karl Baarslag, Oxford University Press. Hear the S O S signal at  Wikipedia.—Chris Cottrill

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