astronomy

John Berry Haycraft

John Berry Haycraft is a astronomy 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 Berry Haycraft rather than just read about it. In short: John Berry Haycraft (bapt. 15 March 1857 – 30 December 1922) was a British physician and professor in physiology who carried out important medical research. Biography John Haycraft was born in Lewes, East Sussex, England, in 1857, the son of actuary John Berry Haycraft.

Key takeaways

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

Reference excerpt

John Berry Haycraft (bapt. 15 March 1857 – 30 December 1922) was a British physician and professor in physiology who carried out important medical research.

Biography John Haycraft was born in Lewes, East Sussex, England, in 1857, the son of actuary John Berry Haycraft. His younger brother was Sir Thomas Haycraft, a judge in the British Colonial Service. He received his medical education at the University of Edinburgh, where he gained an MD on the history, development, and function of the carapace of the chelonia and also a DSc in public health in 1888. He worked for a time in Ludwig's laboratory in Leipzig. In 1880, he was elected a Fellow of the Royal Society of Edinburgh. His proposers were Peter Guthrie Tait, William Rutherford, Sir William Turner, and Sir Thomas Richard Fraser. In 1881, he was appointed chair of physiology at Mason College (which later became the University of Birmingham). He taught in Birmingham and attracted many students to the city. During his years in Birmingham and Edinburgh, Haycraft had been actively engaged in research and published papers on the coagulation of blood and in 1884, he discovered that the leech secreted a powerful anticoagulant, which he named hirudin, although it was not isolated until the 1950s, nor its structure fully determined until 1976. Haycraft returned to London in 1892 and was appointed a research scholar of the British Medical Association. In 1893, he was appointed chair of physiology at University College, Cardiff, where he worked until retirement in 1920. Haycraft died three years later. He died in Royston, Hertfordshire on 30 December 1922. He married Lily Charlotte Isabel Lillie Stacpoole, sister of Henry De Vere Stacpoole. John Stacpoole Haycraft was his grandson.

Books and articles published "Upon the Cause of the Striation of Voluntary Muscular Tissue", Proceedings of the Royal Society of London (1854-1905). 1 January 1880, 31:360–379 "A New Hypothesis concerning Vision", Proceedings of the Royal Society of London (1854-1905). 1 January 1893, 54:272–274 "On the Action of a Secretion Obtained from the Medicinal Leech on the Coagulation of the Blood", Proceedings of the Royal Society of London (1854-1905), 1 January 1883, 36:478–487 Darwinism and Race Progress, London: Scribner, 1895. (Previously published in The Lancet.) The Human Body. A Physiology Reader for Schools, London: Thomas Nelson & Sons, 1902.

References

Illustrations

Worked examples

Example 1 — a first encounter with John Berry Haycraft

Start with the simplest possible case. Write down what John Berry Haycraft claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, 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 Berry Haycraft 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 Berry Haycraft 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 Berry Haycraft

In research: John Berry Haycraft appears in astronomy 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 Berry Haycraft 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 Berry Haycraft is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1857 births, 1922 deaths, Academics of Cardiff University, so understanding it makes those chapters shorter.
In everyday life: Look for John Berry Haycraft 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 Berry Haycraft in 20 minutes

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

Frequently asked questions

What is John Berry Haycraft in simple terms?

John Berry Haycraft (bapt. 15 March 1857 – 30 December 1922) was a British physician and professor in physiology who carried out important medical research. Biography John Haycraft was born in Lewes, East Sussex, England, in 1857, the son of actuary John Berry Haycraft.

Why does John Berry Haycraft matter?

Because it connects several astronomy 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 Berry Haycraft?

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 Berry Haycraft.