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Kerrison Predictor

Kerrison Predictor is a computer 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 Kerrison Predictor rather than just read about it. In short: The Kerrison Predictor was one of the first fully automated anti-aircraft fire-control systems. It was used to automate the aiming of the British Army's Bofors 40 mm guns and provide accurate lead calculations through simple inputs on three main handwheels.

Kerrison Predictor — main illustration
Kerrison Predictor — illustration

Key takeaways

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

Reference excerpt

The Kerrison Predictor was one of the first fully automated anti-aircraft fire-control systems. It was used to automate the aiming of the British Army's Bofors 40 mm guns and provide accurate lead calculations through simple inputs on three main handwheels. The predictor could aim a gun at an aircraft based on simple inputs like the observed speed and the angle to the target. Such devices had been used on ships for gunnery control for some time, and versions such as the Vickers Predictor were available for larger anti-aircraft guns intended to be used against high-altitude bombers. Kerrison's analog computer was the first to be fast enough to be used in the demanding high-speed low-altitude role, which involved very short engagement times and high angular rates. The design was also adopted for use in the United States, where it was produced by Singer Corporation as the M5 Antiaircraft Director, later updated as the M5A1 and M5A2. The M6 was mechanically identical, differing only in running on UK-style 50 Hz power.

… excerpt ends here. Continue reading the full article.

Illustrations

Kerrison Predictor: The Singer M5 was the US version of the Kerrison Predictor. The sighting telescope is near the top, with the elevation handwheel below it and the range handwheel at the right. A second telescope is on the opposite side, not visible here, along with the azimuth handwheel.
The Singer M5 was the US version of the Kerrison Predictor. The sighting telescope is near the top, with the elevation handwheel below it and the range handwheel at the right. A second telescope is on the opposite side, not visible here, along with the azimuth handwheel.

Worked examples

Example 1 — a first encounter with Kerrison Predictor

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

In research
Kerrison Predictor appears in computer 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 Kerrison Predictor 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
Kerrison Predictor is common in secondary-school and first-year university syllabi. It links to neighbouring topics Analog computers, Anti-aircraft artillery, Artillery operation, so understanding it makes those chapters shorter.
In everyday life
Look for Kerrison Predictor 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 Kerrison Predictor in 20 minutes

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

Frequently asked questions

What is Kerrison Predictor in simple terms?

The Kerrison Predictor was one of the first fully automated anti-aircraft fire-control systems. It was used to automate the aiming of the British Army's Bofors 40 mm guns and provide accurate lead calculations through simple inputs on three main handwheels.

Why does Kerrison Predictor matter?

Because it connects several computer 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 Kerrison Predictor?

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 Kerrison Predictor.

Tags

  • Analog computers
  • Anti-aircraft artillery
  • Artillery operation
  • Electro-mechanical computers
  • Fire-control computers of World War II
  • Military computers

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