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Magnet fishing

Magnet fishing 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 Magnet fishing rather than just read about it. In short: Magnet fishing, also called magnetic fishing, is searching in outdoor waters for ferromagnetic objects available to pull with a strong neodymium magnet. Practitioners In English, people who practice magnet fishing may be called magnetfishers or magneteers.

Magnet fishing — main illustration
Magnet fishing — illustration

Key takeaways

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

Reference excerpt

Magnet fishing, also called magnetic fishing, is searching in outdoor waters for ferromagnetic objects available to pull with a strong neodymium magnet.

Practitioners In English, people who practice magnet fishing may be called magnetfishers or magneteers. It is believed that magnet fishing was initially started by boaters using magnets to recover fallen keys from the water. Magnet fishing as a hobby began to take off in the early 2000s starting in Europe.

Objects recovered Magnet fishing can recover metal debris such as discarded bicycles, guns, safes, bombs, grenades, coins, and car tire rims from bodies of water, but many who engage in the hobby hope to find rare and valuable items as well.

Tools

Magnet fishing is typically done with a strong neodymium magnet secured to a durable rope between 15 and 30 meters (50–100 ft), and sometimes a grappling hook as a supplement to the magnet. It is recommended that magnet fishers use protective gloves to protect their hands from any sharp objects they may pull up with their magnet.

Potential harms Some magnet fishers have retrieved dangerous objects, including loaded guns, unexploded ordnance, and sharp pieces of metal. Neodymium magnets are powerful and can interfere with pacemakers, posing a health risk; they can also damage other electronic devices. Fingers can get crushed between the magnet and a piece of metal, potentially causing serious bodily harm. Tetanus can also be a risk for those without an up-to-date tetanus vaccine. In general, police urge those who find weapons or similar items to contact them.

Magnet fishing and the law

Depending on the jurisdiction, anything of value may belong to the local government, not the finder.

Belgium Amateur magnet-fishers in Belgium helped the police by recovering new evidence, specifically firearms and ammunition, related to the crimes of the Brabant killers.

France The rules of magnet fishing are the same as those governing the detection of buried objects: "No one may use equipment capable of detecting metallic objects for the purpose of searching for monuments and objects likely to be of interest to prehistory, history, art or archaeology without first obtaining an administrative authorisation issued in accordance with the applicant’s qualifications and the nature and manner of the search".

Germany In Hamburg, magnet fishing without a permit is punishable by fine. In Berlin, magnet fishing is governed under the same rules as metal detecting, which requires a permit. Permits are not granted to hobbyists, as the context of any find is lost when untrained personnel disturb a site. Like all major cities in Germany that experienced fighting and strategic bombing during World War II, unexploded ordnance poses a serious risk.

England and Wales Magnet fishing is subject to local regulations concerning outdoor waters. The Canal & River Trust, which owns most of the canals in England and Wales, has bylaws prohibiting people from removing material from the canal and rivers it owns, so fishers may be subject to a £25 fine for magnet-fishing or removing any material from canal or inland navigation under the control of the Canal & River Trust in England or Wales, other than the Lee and Stort Navigation, Gloucester and Sharpness Canal, and River Severn Navigation. The Trust "expressly prohibit[s]" the practice, although it refrains from legal action against first-time offenders. In 2018, a child magnet-fished a sawn-off shotgun out of the Titford Canal in Oldbury, West Midlands.

Poland According to Polish penal code, magnet fishing without a valid government permit is a crime punishable by up to two years imprisonment.

Scotland Magnet fishing is allowed in Scotland. If planning to magnet fish in a scheduled area (including the Canal Network), then the fisher must first obtain a Scheduled Monument Consent from Historic Environment Scotland, and permission from Scottish Canals. An official group exists which gives its members permission to magnet fish in a stretch of the Union Canal in Edinburgh, with more locations planned in the future. Archaeological or historical finds must be reported to Treasure Trove Scotland.

United States In the US, no federal laws restrict metal fishing. Magnet fishing in state waters without a license is prohibited in South Carolina under the Underwater Antiquities Act. In Indiana, magnet fishing is allowed on public waters on Department of Natural Resources properties by permit. The magnet must be able to be carried and retrieved by hand. Certain states have their own regulations pertaining to magnet fishing.

Popularity The hobby has been adopted by celebrities such as English rugby player James Haskell.

See also

Metal detector – Electronic instrument which detects the presence of metal nearby Mudlark – Someone who scavenges for items of value on the shores of rivers Rag-and-bone man – Traditional name for some income-seekers Scrap – Recyclable materials left over from manufactured products after their use Tosher – Someone who scavenges in the sewers

References

External links Media related to Magnet fishing at Wikimedia Commons The dictionary definition of magnet fishing at Wiktionary

Illustrations

Magnet fishing: A bolt cutter collected through magnet fishing in the Scarpe at Lallaing, France
A bolt cutter collected through magnet fishing in the Scarpe at Lallaing, France
Magnet fishing: A neodymium magnet used for magnet fishing
A neodymium magnet used for magnet fishing
Magnet fishing: Typical magnet fishing equipment, including protective gloves, a bucket for storing catches, antibacterial hand gel, and a neodymium magnet attached to a rope.
Typical magnet fishing equipment, including protective gloves, a bucket for storing catches, antibacterial hand gel, and a neodymium magnet attached to a rope.
Magnet fishing: Street sign pulled out of the Jizera in Svijany, Czech Republic, with the magnet used to retrieve it still attached to the signpost.
Street sign pulled out of the Jizera in Svijany, Czech Republic, with the magnet used to retrieve it still attached to the signpost.

Worked examples

Example 1 — a first encounter with Magnet fishing

Start with the simplest possible case. Write down what Magnet fishing 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 Magnet fishing 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 Magnet fishing 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 Magnet fishing

In research
Magnet fishing 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 Magnet fishing 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
Magnet fishing is common in secondary-school and first-year university syllabi. It links to neighbouring topics Hobbies, Litter, Magnetism, so understanding it makes those chapters shorter.
In everyday life
Look for Magnet fishing 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 Magnet fishing in 20 minutes

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

Frequently asked questions

What is Magnet fishing in simple terms?

Magnet fishing, also called magnetic fishing, is searching in outdoor waters for ferromagnetic objects available to pull with a strong neodymium magnet. Practitioners In English, people who practice magnet fishing may be called magnetfishers or magneteers.

Why does Magnet fishing 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 Magnet fishing?

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 Magnet fishing.

Tags

  • Hobbies
  • Litter
  • Magnetism
  • Metal detecting
  • Public archaeology
  • Treasure hunting
  • Waste collection
  • Water pollution

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