science

Wire signal

Wire signal is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Wire signal rather than just read about it. In short: 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.

Key takeaways

Wire signal belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Wire signal to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Wire signal from memory before moving on to harder problems.

Reference excerpt

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 operations whereby messages from the dispatcher about changes in railroad routing and scheduling were written on paper forms. Form 19 was designed to be passed to the train as it went through a station at speed. Form 31 required hand delivery for confirmation.

Contemporary usage Today, amateur radio operators still use codes 73 and 88 regularly, and -30- is used in journalism, as it was shorthand for "No more - the end". The Young Ladies Radio League uses code 33 to mean "love sealed with friendship and mutual respect between one YL [young lady] and another YL" or simply "hugs." A once-used but unofficial code 99 meant "go to hell." The other codes have mostly fallen into disuse.

1873 Telegraph Rules from the Lakeshore and Tuscarawas Valley Railway Company The following code was taken from 1873 telegraph rulebook of the Lakeshore and Tuscarawas Valley Railway Company of Cleveland, Ohio.

See also Morse code abbreviations Phillips Code

References

Further reading Alexis C. Madrigal (January 6, 2014), "88, Or How Telegraphers Coded 'Love and Kisses'", The Atlantic, Behold, the emoji heart of 1879. (subscription required) International Communications: The International Telecommunication Union and Universal Postal Union (page 19) Western Union and the Creation of the American Corporate Order, 1845-1893 By Joshua D. Wolff The Telecommunications Illustrated Dictionary, Second Edition Books filed under 'Cipher and telegraph codes', University of Pennsylvania Library online books Western Union Telegraph Company (1866). The Western Union Telegraph Company, rules, regulations, and instructions. Cleveland: Sanford & Hayward, printers. (at University of Michigan Library digital collections)

External links Stuttgart Telegraph Convention 1857 between states of the Austro-Germanic Union. official title "Revised Convention of the Austro-German Telegraph Union, Stuttgart, 3 October 1857, 118 CTS5"? ("Service Instructions" section) Radiotelegraph and Radiotelephone Codes, Prowords And Abbreviations Wood's Plan of Telegraphic Instruction On the Origin of 73 ORIGIN OF HAM SPEAK - FACT, LEGENDS AND MYTHS??? Ham Speak - Know the Lingo SignalHarbor: 73 speak telegraphic and signal codes: annotated directory of scans, transcriptions : notes Nonsecret Code: An Overview of Early Telegraph Codes

Worked examples

Example 1 — a first encounter with Wire signal

Start with the simplest possible case. Write down what Wire signal claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Wire signal before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Wire signal ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Wire signal

In research: Wire signal appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Wire signal in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Wire signal is common in secondary-school and first-year university syllabi. It links to neighbouring topics Brevity codes, Encodings, Telegrams, so understanding it makes those chapters shorter.
In everyday life: Look for Wire signal outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Wire signal in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Wire signal means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Wire signal out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Wire signal in simple terms?

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.

Why does Wire signal matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Wire signal?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Wire signal.