physics

Segner wheel

Segner wheel is a physics 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 Segner wheel rather than just read about it. In short: The Segner wheel or Segner turbine is a type of water turbine invented by Johann Andreas Segner in the 18th century. It uses the same principle as Hero's aeolipile.

Key takeaways

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

Reference excerpt

The Segner wheel or Segner turbine is a type of water turbine invented by Johann Andreas Segner in the 18th century. It uses the same principle as Hero's aeolipile. The device is placed in a suitable hole in the ground (or at the slope of a hill). The water is delivered to the top of a vertical cylinder, at the bottom of which is a rotor with specially bent pipes with nozzles (see image). Due to the hydrostatic pressure, the water is ejected from the nozzles, causing the rotor to rotate. The useful torque is transferred to a powered device through a belt and pulley system. Segner turbines, also called reaction or Scotch turbines, were built in the mid-1850s to power the inclined plane lifts along the Morris Canal in New Jersey. Today, the Segner wheel principle is used in irrigation sprinklers. Alexander Bogdanov cited this an example of an important innovation which paved the way for the development of steam engines. The turbine at Museo Hacienda Buena Vista is "the only pre-Scotch type known to exist and is the sole extant example of a pioneer and historically important machine that was invented at the close of the 17th century by Dr. Baker.... The Buena Vista turbine is, in effect, a missing link in the evolution of mechanical artifacts better known to the historians of technology." (The Journal of the Society for Industrial Archaeology, Vol. 4, No. 1 [1978], pp.55–58)."

Gallery

References

External links

Barker's Mill Archived 2011-06-04 at the Wayback Machine at physics.kenyon.edu One of the last remaining examples is at Lake Hopatcong; there is an excellent picture at [1].

Illustrations

Worked examples

Example 1 — a first encounter with Segner wheel

Start with the simplest possible case. Write down what Segner wheel claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, 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 Segner wheel 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 Segner wheel 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 Segner wheel

In research: Segner wheel appears in physics 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 Segner wheel 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: Segner wheel is common in secondary-school and first-year university syllabi. It links to neighbouring topics Hungarian inventions, Mechanical engineering stubs, Water turbines, so understanding it makes those chapters shorter.
In everyday life: Look for Segner wheel 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Segner wheel” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Segner wheel in 20 minutes

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

Frequently asked questions

What is Segner wheel in simple terms?

The Segner wheel or Segner turbine is a type of water turbine invented by Johann Andreas Segner in the 18th century. It uses the same principle as Hero's aeolipile.

Why does Segner wheel matter?

Because it connects several physics 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 Segner wheel?

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 Segner wheel.