Robots, Drones, and Radar: Electronics Go to War

Robots, Drones, and Radar: Electronics Go to War — page 3
ELECTRONIC COMMUNICATION Communication is crucial for delivering orders during military operations Before the invention of electronics messages were sent in person or by signaling with drums flags or smoke Fhe first electrical telegraph was invented Il in the 1820s The telegraph sent messages along a cable to a receiver using electrical signals The signals were pulses of different voltages The British were the first to use the telegraph in battle during the Crimean War against Russia 1853 1856 Union soldiers unspool a cable to carry telegraph signals during the US Civil War 1861