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Nov 9, 2009 · Developed in the 1830s and 1840s by Samuel Morse and other inventors, the telegraph revolutionized long-distance communication. It worked by transmitting electrical signals over a wire laid...
Nov 24, 2009 · The telegraph, a device which used electric impulses to transmit encoded messages over a wire, would eventually revolutionize long‑distance communication.
- Missy Sullivan
- 1 min
Sep 16, 2024 · In 1843 Morse obtained financial support from the U.S. government to build a demonstration telegraph system 60 km (35 miles) long between Washington, D.C., and Baltimore, Md. Wires were attached by glass insulators to poles alongside a railroad. The system was completed and public use initiated on May 24, 1844, with transmission of the message ...
In 1833, Carl Friedrich Gauss, together with the physics professor Wilhelm Weber in Göttingen, installed a 1,200-metre-long (3,900 ft) wire above the town's roofs. Gauss combined the Poggendorff-Schweigger multiplicator with his magnetometer to build a more sensitive device, the galvanometer .
Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. Thus flag semaphore is a method of telegraphy, whereas pigeon post is not.
The weight of the new cable was 35.75 long hundredweight (4000 lb) per nautical mile (980 kg/km), or nearly twice the weight of the old. The Haymills site successfully manufactured 26,000 nautical miles (48,000 km) of wire (1,600 tons), made by 250 workers over eleven months.
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So basically there are two ways in which long distance phone calls work. First, they can be routed entirely over land and under sea, entirely by wires and cables. And second, they can be routed through the air, which up to the early 1960s meant radio and microwave.
