Claude Chappe

One example of Chappe telegraph tower, in Narbonne, in the south of France.

Claude Chappe was born in Brûlon, Sarthe, France, the grandson of a French baron. He was raised for church service, but lost his sinecure during the French Revolution. He was educated at the Lycée Pierre Corneille in Rouen.[1]

His uncle was the astronomer Jean-Baptiste Chappe d'Auteroche famed for his observations of the Transit of Venus in 1761 and again in 1769. The first book Claude read in his youth was his uncle's journal of the 1761 trip, "Voyage en Siberie". His brother, Abraham, wrote "Reading this book greatly inspired him, and gave him a taste for the physical sciences. From this point on, all his studies, and even his pastimes, were focused on that subject." Because of his astronomer uncle, Claude may also have become familiar with the properties of telescopes.[2]

He and his four unemployed brothers decided to develop a practical system of semaphore relay stations, a task proposed in antiquity, yet never realized.

Claude's brother, Ignace Chappe (1760–1829) was a member of the Legislative Assembly during the French Revolution. With his help, the Assembly supported a proposal to build a relay line from Paris to Lille (fifteen stations, about 120 miles), to carry dispatches from the war.

Chappe's telegraph

The Chappe brothers determined by experiment that the angles of a rod were easier to see than the presence or absence of panels. Their final design had two arms connected by a cross-arm. Each arm had seven positions, and the cross-arm had four more permitting a 196-combination code. The arms were from three to thirty feet long, black, and counterweighted, moved by only two handles. Lamps mounted on the arms proved unsatisfactory for night use. The relay towers were placed from 12 to 25 km (10 to 20 miles) apart. Each tower had a telescope pointing both up and down the relay line.

Chappe first called his invention the tachygraph, meaning "fast writer".[3] However, the Army preferred to use the word telegraph, meaning "far writer", which was coined by French statesman André François Miot de Mélito.[4] Today, in order to distinguish it from subsequent telegraph systems, the French name for Chappe's semaphore telegraph system is named after him, and thus is known as a télégraphe Chappe[5]. Alternatively, Chappe coined the phrase semaphore[6], from the Greek elements σῆμα (sêma, "sign"); and from φορός (phorós, "carrying"),[7] or φορά (phorá, "a carrying") from φέρειν (phérein, "to bear").[8]

In 1792, the first messages were successfully sent between Paris and Lille.[5] In 1794 the semaphore line informed Parisians of the capture of Condé-sur-l'Escaut from the Austrians less than an hour after it occurred. Other lines were built, including a line from Paris to Toulon. The system was widely copied by other European states, and was used by Napoleon to coordinate his empire and army.[5]

In 1805, Claude Chappe killed himself.[9] He was said to be depressed by illness, and claims by rivals that he had plagiarized from military semaphore systems.

Demonstration of the semaphore

In 1824 Ignace Chappe attempted to increase interest in using the semaphore line for commercial messages, such as commodity prices; however, the business community resisted.

In 1846, the government of France committed to a new system of electric telegraph lines. Many contemporaries warned of the ease of sabotage and interruption of service by cutting a wire. With the emergence of the electric telegraph, slowly the Chappe telegraph ended in 1852.[5]

The Chappe semaphore figures prominently in Alexandre Dumas' The Count of Monte Cristo. The Count bribes an underpaid operator to transmit a false message.

A bronze sculpture of Claude Chappe was erected at the crossing of Rue du Bac and Boulevard Raspail, in Paris. It was removed and melted down during the Nazi occupation of Paris, in 1941 or 1942.[10]

• Chappe code

• Beyer, Rick, The Greatest Stories Never Told, A&E Television Networks / The History Channel, ISBN 0-06-001401-6

• Gerard J. Holzmann and Bjorn Pehrson, The Early History of Data Networks, John Wiley & Sons, ISBN 0818667826

• French article: Les Télégraphes Chappe, l'Ecole Centrale de Lyon
• French article: Le télégraphe aérien, in Les merveilles de la science, de Louis Figuier, t. 2, pages 20–68
• Italian article: Francesco Frasca, Il telegrafo ottico dalla Rivoluzione francese alla guerra di Crimea, in Informazioni della Difesa, n°1, 2000, Roma: Stato Maggiore della Difesa, pp. 44–51