TelegraphyTelegraphy 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. Ancient signalling systems, although sometimes quite extensive and sophisticated as in China, were generally not capable of transmitting arbitrary text messages.
Electrical telegraphElectrical telegraphy is point-to-point distance communicating via sending electric signals over wire, a system primarily used from the 1840s until the late 20th century. It was the first electrical telecommunications system and the most widely used of a number of early messaging systems called telegraphs, that were devised to send text messages more quickly than physically carrying them. Electrical telegraphy can be considered the first example of electrical engineering.
Printing telegraphThe printing telegraph is a device for sending and receiving telegraph messages. The sending operator uses a piano-style keyboard to directly input the text of the message, and the receiver instantly prints the text of the message on a paper strip. HistoryThe printing telegraph was invented by Royal Earl House in 1846. House's telegraph could transmit around 40 instantly readable words per minute, but was difficult to manufacture in bulk.
TelephoneA telephone, commonly shortened to phone, is a telecommunications device that enables two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables and other communication channels to another telephone which reproduces the sound to the receiving user.
Morse codeMorse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. It is named after Samuel Morse, one of several developers of the system. Morse's preliminary proposal for a telegraph code was replaced by an alphabet-based code developed by Alfred Vail, the engineer working with Morse. Vail's version was used for commercial telegraphy in North America.
Text messagingAct of typing and sending a brief, digital messageA text message using SMS – the 160-character limit and difficulty of typing on feature phone keypads led to the abbreviations of "SMS language". In plain English, the message says: "It is great to see you tonight.
Telegraph boyIn many English-speaking countries, a telegram delivery boy, telegraph boy or telegram boy was a young man employed to deliver telegrams, usually on bicycle. In the United Kingdom, these messengers were employed by the General Post Office; in the United States, they worked for Western Union or other telegraph companies.
Submarine communications cableTransoceanic communication line placed on the seabedA cross section of the shore-end of a modern submarine communications cable.
Business correspondenceBusiness correspondence means the exchange of information in a written format for the process of business activities. Business correspondence can take place between organizations, within organizations or between the customers and the organization. The correspondence refers to the written communication between persons. Hence oral communication or face to face communication is not a business correspondence.
CommunicationTransmission of information"Communicate" redirects here. For other uses, see Communicate (other).There are many forms of communication, including human linguistic communication using sounds, sign language, and writing as well as animals exchanging information and attempts to communicate with intelligent extraterrestrial life.Communication is commonly defined as the transmission of information.
MailThe mail, or post, is a system for physically transporting postcards, letters, and parcels. A postal service can be private or public, though many governments place restrictions on private systems. Since the mid-19th century, national postal systems have generally been established as a government monopoly, with a fee on the article prepaid. Proof of payment is usually in the form of an adhesive postage stamp, but a postage meter is also used for bulk mailing.*As an Amazon Associate I earn from qualifying purchases.