physics

George Dollond

George Dollond 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 George Dollond rather than just read about it. In short: George Dollond (10 June 1774 – 30 November 1852) was an English optician who constructed precision optical instruments used in astronomy, geodesy and also in navigation. Together with Peter Barlow, he also invented an afocal system to extend the focal length of telescopes, called the Barlow lens.

Key takeaways

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

Reference excerpt

George Dollond (10 June 1774 – 30 November 1852) was an English optician who constructed precision optical instruments used in astronomy, geodesy and also in navigation. Together with Peter Barlow, he also invented an afocal system to extend the focal length of telescopes, called the Barlow lens.

Biography

He was born in London, the nephew of the famous optician Peter Dollond. He was the son of John Dollond's daughter, Susan (or Susanne) (1728–1798) who married William Huggins. His father died when he was a child. When George Huggins went into partnership with Peter Dollond in 1805, he changed his name by licence to Dollond. He was elected a Fellow of the Royal Society in December 1819. In 1820 Peter Dollond and George Dollond became opticians to George IV. In the same year, he was one of the founding Fellows of the Royal Astronomical Society. He died in 1852 at Camberwell Terrace North and was buried at West Norwood Cemetery. His business interests were inherited by his nephew and former apprentice, George Huggins (1797–1866), who in the same year changed his surname to Dollond.

References

Rolf Riekher, Fernrohre und ihre Meister, Berlin 1957. (in German) Gloria Clifton, 'Dollond family (per. 1750–1871)’, Oxford Dictionary of National Biography, Oxford University Press, 2004; online edn, Sept 2013 accessed 1 July 2015 [Access via public library]

Worked examples

Example 1 — a first encounter with George Dollond

Start with the simplest possible case. Write down what George Dollond 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 George Dollond 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 George Dollond 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 George Dollond

In research: George Dollond 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 George Dollond 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: George Dollond is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1774 births, 1852 deaths, 19th-century British astronomers, so understanding it makes those chapters shorter.
In everyday life: Look for George Dollond 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 “George Dollond” →

Affiliate

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

How to study George Dollond in 20 minutes

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

Frequently asked questions

What is George Dollond in simple terms?

Why does George Dollond 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 George Dollond?

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 George Dollond.