engineering

John David Gwynn

John David Gwynn 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 John David Gwynn rather than just read about it. In short: John David Gwynn (13 July 1907 – 21 November 1998) was a civil engineer with a special interest in renewable energy generation. In his youth he was one of Ireland's most distinguished cricketers.

Key takeaways

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

Reference excerpt

John David Gwynn (13 July 1907 – 21 November 1998) was a civil engineer with a special interest in renewable energy generation. In his youth he was one of Ireland's most distinguished cricketers. John David Gwynn (known to family and friends as "David" or "JD") was born in Dublin on 13 July 1907. He was the eldest child of Edward Gwynn, an academic and sometime Provost of Trinity College Dublin, and Olive Mary Gwynn née Ponsonby. In accordance with family tradition he was educated at St Columba's College, Dublin and then at Trinity College Dublin, where he studied civil engineering. While still an undergraduate he was employed by the Siemens company to assist in their work on the Shannon hydroelectric scheme. Gwynn went on to become a chartered civil engineer, a Fellow of the Institution of Civil Engineers and a Member of the Institute of Mechanical Engineers. After graduating BAI in 1930 he worked on Newport Bridge in Middlesbrough as an employee of the company Mott, Hay and Anderson. In 1936 he joined Balfour Beatty and was engaged on the extension of the Piccadilly Line for London Transport. In the early 1940s J. D. Gwynn was again involved in developing hydro-electric power infrastructure, this time in Scotland. As the second World War continued he was put in charge of building the Churchill Barriers in Scapa Flow, Orkney, a task which occupied him from 1942 to 1944. After the war he supervised further hydro-electric schemes both in the UK and overseas. Among other assignments he was chief engineer for the Kainji Dam Project in Nigeria. He became a director of Balfour Beatty in 1963, and a director of Engineering Power and Development Consultants in 1967. In 1966 an honorary MAI degree was conferred upon him by Trinity College, Dublin. After his retirement from Balfour Beatty David Gwynn turned to the field of renewable energy, where with characteristic vigour and enthusiasm he proceeded to undertake research and develop innovative experimental designs. With his team he mounted trial schemes for various small scale stream-driven turbines as well as much larger tidal power devices, and he continued this voluntary work right up to the end of his life. J D Gwynn married twice. His first wife, Grace Lee, was a historian; she died in 1964. They had two children: Lee Penelope, a teacher and local government politician, and Robin David, an academic historian and philatelist. J D Gwynn later married Esther Hulbert, a musicologist and singer, who also predeceased him. He died at the age of 91 on 21 November 1998.

Cricketing career A right-handed batsman, he played one first-class match for Dublin University against Northamptonshire in July 1926, a match that also featured the Irish playwright Samuel Beckett. Gwynn came from a cricketing family. Three of his uncles (Arthur, Lucius and Robin) all represented Ireland, whilst a fourth uncle, Jack, played first-class cricket in India.

References

Illustrations

Worked examples

Example 1 — a first encounter with John David Gwynn

Start with the simplest possible case. Write down what John David Gwynn 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 John David Gwynn 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 John David Gwynn 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 John David Gwynn

In research: John David Gwynn 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 John David Gwynn 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: John David Gwynn is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1907 births, 1998 deaths, 20th-century Irish engineers, so understanding it makes those chapters shorter.
In everyday life: Look for John David Gwynn 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 John David Gwynn in 20 minutes

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

Frequently asked questions

What is John David Gwynn in simple terms?

John David Gwynn (13 July 1907 – 21 November 1998) was a civil engineer with a special interest in renewable energy generation. In his youth he was one of Ireland's most distinguished cricketers.

Why does John David Gwynn 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 John David Gwynn?

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 John David Gwynn.