engineering

Xavier Ract-Madoux

Xavier Ract-Madoux is a engineering 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 Xavier Ract-Madoux rather than just read about it. In short: Xavier Ract-Madoux was a French hydraulician. He joined Electricité de France (EDF) in 1947 and remained with them for the rest of his working life.

Key takeaways

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

Reference excerpt

Xavier Ract-Madoux was a French hydraulician. He joined Electricité de France (EDF) in 1947 and remained with them for the rest of his working life. He became Controller General of EDF in 1973, and later became a vice-director. He was a member of the Société Hydrotechnique de France and the General Secretary of the French Committee of Large Dams. In the summer of 1949, Xavier Ract-Madoux and L. Reynaud, tested an electrothermal ice drill in the Alps. They were surveying the Mer de Glace for EDF to determine if it could be used as a source of hydroelectric power. Experiments in 1944 had demonstrated that using explosives to clear tunnels through the ice was ineffective; some passages to the interior of the glacier were opened by digging, but these closed within days due to the pressure and plasticity of the ice, which overwhelmed any attempt to brace the tunnels open with wood. Ract-Madoux and Reynaud's drill consisted of a 1 m-long (3.3 ft) resistor wound in a cone shape, with a maximum diameter of 50 mm. This was suspended from a cable via a tripod over the borehole, and was able to drill 24 m (79 ft) in an hour under ideal conditions.

References

Sources Hager, Willi (2014). Hydraulicians in Europe 1800-2000, Volume 2. Boca Raton, Florida: CRC Press. ISBN 978-1-4665-5498-6. Nizery, A. (February 1951). "Electrothermic rig for the boring of glaciers". Transactions, American Geophysical Union. 32 (1): 66–72. Bibcode:1951TrAGU..32...66N. doi:10.1029/tr032i001p00066. Ract-Madoux, M.; Reynaud, L. (1951). "L'exploration des glaciers en profondeur" (PDF). La Houille Blanche (in French). 37 (Special): 299–308. doi:10.1051/lhb/1951009.

Worked examples

Example 1 — a first encounter with Xavier Ract-Madoux

Start with the simplest possible case. Write down what Xavier Ract-Madoux claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, 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 Xavier Ract-Madoux 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 Xavier Ract-Madoux 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 Xavier Ract-Madoux

In research: Xavier Ract-Madoux appears in engineering 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 Xavier Ract-Madoux 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: Xavier Ract-Madoux is common in secondary-school and first-year university syllabi. It links to neighbouring topics 20th-century French civil servants, 20th-century French engineers, French engineer stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Xavier Ract-Madoux 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 Xavier Ract-Madoux in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Xavier Ract-Madoux 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 Xavier Ract-Madoux out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Xavier Ract-Madoux in simple terms?

Xavier Ract-Madoux was a French hydraulician. He joined Electricité de France (EDF) in 1947 and remained with them for the rest of his working life.

Why does Xavier Ract-Madoux matter?

Because it connects several engineering 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 Xavier Ract-Madoux?

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 Xavier Ract-Madoux.