Trystan Casey
The non-electric telegraph, also known as the optical telegraph, was invented in the late 18th century by Claude Chappe. Chappe's system was widely used in France and other European nations occupied by France during the Napoleonic era. The optical telegraph was eventually replaced by the electric telegraph in the mid-19th century. The electric telegraph was the result of scientific advancements in electricity that had been taking place since the 18th century. The first experimental system over a substantial distance was developed by Ronalds in 1816, but it was rejected by the British Admiralty as they already had an adequate optical telegraph system in place.
| Characteristics | Values |
|---|---|
| Inventor of the non-electric telegraph | Claude Chappe |
| Year of invention | Late 18th century |
| Country of invention | France |
| Purpose | Transmitting and receiving messages over long distances |
| Type of technology | Optical telegraph |
| Replacement | Electric telegraph |
| Year of replacement | Mid-19th century |
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What You'll Learn
The Chappe telegraph
The first Chappe telegraph line was a series of towers linking Paris and Lille, a distance of 230 kilometres. The Paris-Lille line was operational for military purposes only. Its fifteen towers made it possible to transmit a short message between these two cities within 9 minutes. Later developments added the major French cities, with Paris being the central node of the system. Between Paris and Brest in Brittany, 58 stations dotted the route. In addition to Paris-Lille in 1794, other cities initially served were Strasbourg in 1798 and Brest in 1799. By the mid-19th century, the network spanned several hundred kilometres and covered most major French cities as well as Venice, Mainz and Amsterdam.
Chappe described his invention as:
> a reliable means of establishing a correspondence such that the legislative body can send its orders to our frontiers and receive the answer during the duration of the same session.
He also emphasised the benefits of the system for the political unification of France:
> The establishment of the telegraph is, in fact, the best response to authors who think that France is too large to form a Republic. The telegraph shortens distances and somehow unites an immense population at a single point.
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Early ideas for an electric telegraph
The idea of using electricity for communication over distance is said to have occurred to Samuel Morse during a conversation aboard a ship returning from Europe in 1832. However, Morse was not the first person to think of the idea of an electric telegraph. Early ideas for an electric telegraph included using electrostatic deflections of pith balls in 1753, and proposals for electrochemical bubbles in acid by Campillo in 1804 and von Sömmering in 1809.
In 1831, Princeton's Joseph Henry, a pioneer in the field of electricity, published an article that contained details suggesting the idea of an electric telegraph. He had previously rung a bell at a distance by opening and closing an electric circuit. Morse was unaware of this article, but with the help of Professor Gale, who was familiar with Henry's work, he was able to develop his telegraph system. Gale pointed out flaws in Morse's system and showed him how to boost signal strength and overcome distance problems by using a relay system invented by Henry.
Another early idea for an electric telegraph was the voltaic cell, invented by Alessandro Volta of Italy in 1800. This device made it possible to power electric devices more effectively using relatively low voltages and high currents. Before this, early methods of producing electricity employed the frictional generation of static electricity, which led to high voltages and low currents.
The immediate predecessors of the electric telegraph were homing pigeons, visual networks, the Pony Express, and railroads. Visual telegraphs used flags, lights, or towers with movable arms to convey messages over long distances. One of the most successful visual telegraphs was the semaphore, developed in France by the Chappe brothers, Claude and Ignace, in 1791. This system consisted of pairs of movable arms mounted at the ends of a crossbeam on hilltop towers, with each arm capable of assuming seven angular positions 45 degrees apart. Chains of these towers were built to permit transmission over long distances, and a signalling rate of three symbols per minute could be achieved.
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The voltaic cell
Prior to the voltaic cell, electricity was generated through friction, resulting in high voltages and low currents. Devices using high-voltage static electricity, such as pith balls and sparks, were proposed for telegraphic systems but faced significant challenges due to transmission wire losses, especially in unfavourable weather conditions. This restricted their reliable operation to short distances.
Alessandro Volta's invention of the voltaic cell changed this by providing a continuous and stable source of low-voltage current. This current could be utilised to produce more distinct effects, offering a significant improvement over the momentary discharge of electrostatic machines or Leyden jars, which were the only known human-made sources of electricity at the time.
Furthermore, the invention of the voltaic cell marked a significant milestone in the understanding and application of electricity. It inspired further exploration and experimentation, leading to advancements in various fields beyond just telegraphy. The voltaic cell's ability to provide a controlled and stable source of electricity laid the foundation for numerous innovations that have shaped modern technology and our understanding of electrical phenomena.
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The first electric telegraph in the USA
The first electric telegraph was invented in the early 19th century, with early ideas for an electric telegraph emerging in the 18th century. The first experimental system over a substantial distance was built by English inventor Francis Ronalds in 1816. Ronalds offered his invention to the British Admiralty, but it was rejected as unnecessary. The first working electric telegraph was invented by Ronalds, using static electricity.
In the United States, Samuel F. B. Morse played a key role in the development of the electric telegraph. Morse, a professor of painting and sculpture at the University of the City of New York, began working on his version of the telegraph in 1832. He developed Morse Code, a set of sounds that corresponded to particular letters of the alphabet, in 1835. By 1838, he had presented his concept to the US Congress.
Morse was not the only person working on the electric telegraph at this time. Sixty-two people had claimed to invent the first electric telegraph by 1838. However, Morse was the first to gain political backing for his telegraph and develop a business model for it. In 1837, he was granted a patent for an electromagnetic telegraph.
In 1843, Morse built a telegraph system from Washington, D.C., to Baltimore with financial support from Congress. On May 24, 1844, the first message, "What hath God wrought?", was sent. The electric telegraph soon superseded optical telegraph systems, becoming the standard way to send urgent messages. By the latter half of the 19th century, most developed nations had commercial telegraph networks, allowing the public to send messages (called telegrams) for a fee.
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The first practical electric telegraphs
The first two practical electric telegraphs were invented almost simultaneously. In 1837, British inventors Sir William Fothergill Cooke and Sir Charles Wheatstone patented a five-needle, six-wire telegraph system. This system displayed the letter being transmitted, eliminating the need for operators to learn a code.
Around the same time, Samuel F.B. Morse, a professor of painting and sculpture at New York University, began working on his version of the electric telegraph. In 1835, he devised a system of dots and dashes to represent letters and numbers, now known as Morse Code. In 1837, Morse obtained a patent for an electromagnetic telegraph.
Morse's system faced initial setbacks, with 62 people claiming to have invented the first electric telegraph by 1838. However, Morse gained political backing and developed a business model for his invention. In 1843, with financial support from Congress, he built a telegraph line from Washington, D.C., to Baltimore. On May 24, 1844, the first message, "What hath God wrought?" was transmitted.
The electric telegraph gradually replaced the optical telegraph, which had been in use since the late 18th century, with the Cooke and Wheatstone telegraph initially adopted in Britain. The Morse system was adopted as the international standard in 1865, using a modified version of Morse Code developed in Germany in 1848.
The telegraph's impact was profound, compressing distances and transforming politics and business. It enabled the exchange of information on a global scale, fostering connections between nations and contributing to the establishment of world peace.
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Frequently asked questions
The non-electric telegraph, also known as the optical telegraph, was invented in France by Claude Chappe in the late 18th century.
The earliest non-electric telegraph was the Chappe telegraph, an optical telegraph system.
The Chappe telegraph used a system of visual signals, such as flags and torches, to transmit messages over long distances.
The non-electric telegraph began to be replaced by the electric telegraph in the mid-19th century. However, the French were slow to adopt the new technology due to their established optical telegraph system.
The non-electric telegraph was limited by poor weather conditions and could only be used during the day. It also required a clear line of sight between the sender and receiver.
