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chemistry

Witches' stones

Witches' stones is a chemistry 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 Witches' stones rather than just read about it. In short: Witches' stones (in Jèrriais: pièrres dé chorchièrs) are flat stones jutting from chimneys in the islands of Jersey and Guernsey. Traditional vernacular architecture in Jersey is in granite and such witches' stones can be seen protruding from many older houses.

Witches' stones — main illustration
Witches' stones — illustration

Key takeaways

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

Reference excerpt

Witches' stones (in Jèrriais: pièrres dé chorchièrs) are flat stones jutting from chimneys in the islands of Jersey and Guernsey. Traditional vernacular architecture in Jersey is in granite and such witches' stones can be seen protruding from many older houses. According to folklores in the Channel Islands, these small ledges were used by witches to rest on as they fly to their sabbats. Householders would provide these platforms to appease witches and avoid their ill favours. The true origin of this architectural feature is to protect thatched roofs from seeping water running down the sides of the chimney stack. Thatched roofs being thicker than tiled roofs, the jutting stones would sit snugly on the thatch – as can be seen on the few remaining thatched roofs in Jersey. When thatch began to be generally replaced by pantiles in the 18th century, and later by slates, the witches' stones were left protruding prominently from the chimney stack. This either gave rise to the belief in witches' resting places, or reinforced an existing belief. Fear of witches was widespread in country areas well into the 20th century in Jersey. The force of tradition can be seen in a number of newly constructed houses in vernacular style that sport witches' stones despite never having had a thatched roof.

In England Although not common in England, witch stones or witch seats can be found in the villages of Feizor, near Settle, and at Wharfe both in North Yorkshire.

See also Architecture of Normandy Adder stones, which are also called witches' stones

References

Des pièrres dé chorchièrs

Illustrations

Witches' stones illustration
Witches' stones illustration
Witches' stones illustration
Witches' stones illustration
Witches' stones illustration

Worked examples

Example 1 — a first encounter with Witches' stones

Start with the simplest possible case. Write down what Witches' stones claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, 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 Witches' stones 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 Witches' stones 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 Witches' stones

In research
Witches' stones appears in chemistry 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 Witches' stones 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
Witches' stones is common in secondary-school and first-year university syllabi. It links to neighbouring topics Architectural elements, Culture of Jersey, Jersey stubs, so understanding it makes those chapters shorter.
In everyday life
Look for Witches' stones 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 Witches' stones in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Witches' stones 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 Witches' stones out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Witches' stones in simple terms?

Witches' stones (in Jèrriais: pièrres dé chorchièrs) are flat stones jutting from chimneys in the islands of Jersey and Guernsey. Traditional vernacular architecture in Jersey is in granite and such witches' stones can be seen protruding from many older houses.

Why does Witches' stones matter?

Because it connects several chemistry 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 Witches' stones?

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 Witches' stones.

Tags

  • Architectural elements
  • Culture of Jersey
  • Jersey stubs
  • Stonemasonry
  • Witchcraft in England

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