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Wire Signal
A wire signal is a brevity code used by telegraphers to save time and cost when sending long messages. The best-known code was the 92 Code adopted by Western Union in 1859. The code was designed to reduce bandwidth consumption over telegraph lines, thus speeding transmissions by utilizing a numerical code system for frequently used phrases. 92 Code Several of the codes are taken from ''The Telegraph Instructor'' by G.M. Dodge. Dodge notes: :Other numerical signals are used by different railroads for different purposes, for instance, the signal “47” upon some railroads means “display signals”; while the signal “48” means “signals are displayed”. The numerals “9” and “12” are frequently used for “correct”. Other numerals are used for the different officials’ messages, agents’ messages, etc. Codes that are not listed in the 1901 edition of Dodge are marked with an asterisk (*). In the above list, the numbers 19 and 31 refer to train order oper ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brevity Code
Brevity is concision or brevitas, the quality of being brief or concise, or: * Brevity (comic strip), ''Brevity'' (comic strip), a comic strip created by Guy Endore-Kaiser and Rodd Perry * Brevity code, a vocal word replacement system * Operation Brevity, a World War II battle {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Western Union
The Western Union Company is an American multinational financial services corporation headquartered in Denver, Denver, Colorado. Founded in 1851 as the New York and Mississippi Valley Printing Telegraph Company in Rochester, New York, the company changed its name to the Western Union Telegraph Company in 1856 after merging with several other telegraph companies. It dominated the American telegraphy industry from the 1860s to the 1980s, pioneering technology such as telex and developing a range of telegraph-related services, including wire transfer, wire money transfer, in addition to its core business of transmitting and delivering telegram messages. After experiencing financial difficulties, it began to move its business away from communications in the 1980s and increasingly focused on its money-transfer services. It ceased its communications operations completely in 2006, at which time ''The New York Times'' described it as "the world's largest money-transfer business" and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bandwidth (signal Processing)
Bandwidth is the difference between the upper and lower Frequency, frequencies in a continuous Frequency band, band of frequencies. It is typically measured in unit of measurement, unit of hertz (symbol Hz). It may refer more specifically to two subcategories: ''Passband bandwidth'' is the difference between the upper and lower cutoff frequencies of, for example, a band-pass filter, a communication channel, or a signal spectrum. ''Baseband bandwidth'' is equal to the upper cutoff frequency of a low-pass filter or baseband signal, which includes a zero frequency. Bandwidth in hertz is a central concept in many fields, including electronics, information theory, digital communications, radio communications, signal processing, and spectroscopy and is one of the determinants of the capacity of a given communication channel. A key characteristic of bandwidth is that any band of a given width can carry the same amount of information, regardless of where that band is located in the f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrical Telegraph
Electrical 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. Electrical telegraphy consisted of two or more geographically separated stations, called telegraph offices. The offices were connected by wires, usually supported overhead on utility poles. Many electrical telegraph systems were invented that operated in different ways, but the ones that became widespread fit into two broad categories. First are the needle telegraphs, in which electric current sent down the telegraph line produces electromagnetic force to move a needle-shaped pointer into position o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Train Order Operation
Train order operation is a system for safely moving trains using train orders, as opposed to fixed signals or cab signalling. In train order operation, a "train order" is an order issued by or through a proper railway official to govern the movement of trains. Train order operation was widely used by the railroads of North America before the days of centralized traffic control (CTC), direct traffic control (DTC), and the use of track warrants conveyed by radio. The system used a set of rules when direct communication between train dispatchers and trains was limited or non-existent. Trains would follow a predetermined operating plan, known as the timetable, unless superseded by train orders conveyed to the train from the dispatcher, through local intermediaries. Train order operation was a system that required minimum human overhead in an era before widespread use of technology-based automation. It was the most practical way for railroads with limited capital resources, or l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amateur Radio
Amateur radio, also known as ham radio, is the use of the radio frequency radio spectrum, spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency, emergency communications. The term ''"radio amateur"'' is used to specify ''"a duly authorized person interested in radioelectric practice with a purely personal aim and without wikt:pecuniary, pecuniary interest"'' (either direct monetary or other similar reward); and to differentiate it from commercial broadcasting, public safety (police and fire), or two-way radio professional services (maritime, aviation, taxis, etc.). The amateur radio service (''amateur service'' and ''amateur-satellite service'') is established by the International Telecommunication Union (ITU) through their recommended radio regulations. National governments regulate technical and operational characteristics of transmissions and issue individual station li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
-30-
-30- has been traditionally used by journalists in North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ... to indicate the end of a story or article that is submitted for editing and typesetting. It is commonly employed when writing on Time limit, deadline and sending bits of the story at a time, via telegraphy, teletype, electronic transmission, or paper copy, as a necessary way to indicate the end of the article. It is also found at the end of press releases. The origin of the term is unknown. One theory is that the journalistic employment of -30- originated from the number's use during the American Civil War era in the 92 Code of Telegraphy, telegraphic shorthand, where it signified the end of a transmission and that it found further favor when it was included in the P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Young Ladies Radio League
The Young Ladies Radio League (YLRL) is an international non-profit organization of women amateur radio enthusiasts. It was founded in 1939 and is affiliated with the American Radio Relay League. The term "Young Lady" derives from a Morse code abbreviation, YL, that is used to refer to female amateur radio operators, regardless of age. (As male operators of any age are addressed as OM or "old man", the non-licensed spouse of an OM is often called an XYL.) The Young Ladies' Radio League welcomes all licensed amateur radio women as members. The YLRL is organized into 10 districts in the United States (that correspond to the 10 amateur radio call sign districts), a district for Canada, and a "DX" district that covers the rest of the world. The YLRL holds a tri-annual convention at various locations. Services The YLRL provides many services for its members including publishing a bimonthly newsletter, ''YL Harmonics''. It also provides an audio tape version of ''YL Harmonics'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cleveland, Tuscarawas Valley And Wheeling Railway
Cleveland, Tuscarawas Valley and Wheeling Railway operated in eastern Ohio and West Virginia from 1875 to 1882. The Lakeshore and Tuscarawas Valley Railway Company organized by filing with the Ohio Secretary of State on July 2, 1870 to build a road from near Berea to Mill Township, Tuscarawas County, Ohio where it would interchange with the Pittsburgh, Cincinnati and St. Louis Railway, with a branch to Elyria. The road was completed in August 1873 from Elyria through Grafton, Massillon, and New Philadelphia to Uhrichsville. On October 30, 1872, the company purchased the Elyria and Black River Railroad forming a line from Uhrichsville to Lorain on Lake Erie. The Lakeshore and Tuscarawas Valley Railway Company filed a certificate March 3, 1873 to extend a line from Uhrichsville into Washington Township, Harrison County. Foreclosure was filed on the railroad July, 1874, for $2,180,000 debt, and it sold for one million dollars January 26, 1875, to a company that incorporat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cleveland, Ohio
Cleveland is a city in the U.S. state of Ohio and the county seat of Cuyahoga County, Ohio, Cuyahoga County. Located along the southern shore of Lake Erie, it is situated across the Canada–United States border, Canada–U.S. maritime border and approximately west of the Ohio-Pennsylvania state border. Cleveland is the most populous city on Lake Erie, the list of cities in Ohio, second-most populous city in Ohio, and the List of United States cities by population, 53rd-most populous city in the U.S. with a population of 372,624 in 2020. The city anchors the Greater Cleveland, Cleveland metropolitan area, the Metropolitan statistical area, 33rd-largest in the U.S. at 2.18 million residents, as well as the larger Cleveland–Akron, Ohio, Akron–Canton, Ohio, Canton combined statistical area with 3.63 million residents. Cleveland was founded in 1796 near the mouth of the Cuyahoga River as part of the Connecticut Western Reserve in modern-day Northeast Ohio by General Moses Clea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morse Code Abbreviations
Morse code abbreviations are used to speed up Morse communications by foreshortening textual words and phrases. Morse abbreviations are short forms, representing normal textual words and phrases formed from some (fewer) characters taken from the word or phrase being abbreviated. Many are typical English abbreviations, or short acronyms for often-used phrases. Distinct from prosigns and commercial codes Morse code abbreviations are not the same as prosigns. Morse abbreviations are composed of (normal) textual alpha-numeric character symbols with normal Morse code inter-character spacing; the character symbols in abbreviations, unlike the delineated character groups representing Morse code prosigns, are not "run together" or concatenated in the way most prosigns are formed. Although a few abbreviations (such as for "dollar") are carried over from former commercial telegraph codes, almost all Morse abbreviations are ''not'' commercial codes. From 1845 until well into the se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phillips Code
The Phillips Code is a brevity code (shorthand) compiled and expanded in 1879 by Walter P. Phillips (then of the Associated Press) for the rapid transmission of telegraph messages, including press reports. Overview It was compiled in 1879 by Walter P. Phillips, who explained that he was in large part putting down the collective experience of generations of telegraph operators. In the introduction to the 1907 edition of his book, "The Phillips Code: A Thoroughly Tested Method of Shorthand Arranged for Telegraphic Purposes. And Contemplating the Rapid Transmission of Press Reports; Also Intended to be Used as an Easily Acquired Method for General Newspaper and Court Reporting," Phillips wrote, "Research suggests that at one time, commercial telegraphs and railroads had numerical codes that contained at least 100 groupings. Few survived beyond the turn of the century. The compilation in this book represents the consensus of many whose duties brought them into close contact with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
