East Cape Signal Towers in the context of the history of long- distance communication

Sending messages and signals over long distances has been a human endeavour since earliest times. Signalling has most often involved the use of some form of technology, although at times this can be as simple as the raising of an eyebrow or a wink at a meeting. Up until the time of electrical and electronic impulses and their interpretation, nearly all signalling was dependent on the use of light (optical signalling) and occasionally sound. This article is confined to a brief historical overview of long-distance communication and some of the more significant technologies associated with these endeavours. It concludes with the construction and use of the East Cape Signal Towers in the 1840s.