22 JUN 2013 by ideonexus

 A Brief History of Signals

Prior to the advent of practical electrical communication, human beings had been signaling over a distance in all kinds of ways. The bell in the church tower called people to religious services or “for whom the bell tolls”—the announcement of a death. We knew a priori several things about church bells. We knew approximately when services were to begin, and we knew that a long, slow tolling of the bells announced death. Thus we could distinguish one from the other, namely a call to relig...
Folksonomies: communications signals
Folksonomies: communications signals
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From church bells, speech, body language, semaphores, fires, and smoke signals.