- Relay league
A relay league is a chain of message forwarding stations in a system of
optical telegraphs, radio telegraph stations, or riding couriers.
An interesting description of these early 19th century methods and its evolution into the
electrical telegraphnetworks of the mid and late 1800s is found in "The Victorian Internet", a book by Tom Standage ISBN 0425171698.
Radio relay leagues
Radio amateurs have been early in arranging relay leagues, as is reflected in the name of the organization of
American Radio Relay League(ARRL), http://www.arrl.org/.
Radio amateur message relay operations were originally conducted using
Morse codein the first two decades of the 20th century using spark-gap transmitters. As vacuum tubes became affordable operations shifted to more efficient manual telegraphy transmitters, referred to as CW ( Continuous wave). Messages were relayed station to station typically covering four or more re-transmission cycles to cover the continental United States, in an organized system of amateur radio networks. After World War II, voice and radioteletypeimplementations of the message relay system were employed.
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