SCIENCE, INDUSTRY & BUSINESS LIBRARY / NEW YORK PUBLIC LIBRARY / SCIENCE PHOTO LIBRARY SCIENCE, INDUSTRY & BUSINESS LIBRARY / NEW YORK PUBLIC LIBRARY / SCIENCE PHOTO LIBRARY
Telegraph operator, historical artwork. Telegraph transmitters were used to send information as a series of electric pulses. The operator is tapping out a signal that is changing the electrical current flowing through the wire at lower right. Electric telegraphs were an important application of the newly-discovered electromagnetic force. The first practical telegraph was invented by Samuel Morse in 1837. They quickly spread across the USA and Europe, and revolutionized communications. The two continents were permanently linked in 1866. This telegraph is at Nine Elms, England. Artwork published in a 19th century newspaper.
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