physics

John Allan Broun

John Allan Broun 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 John Allan Broun rather than just read about it. In short: John Allan Broun FRS (21 September 1817 – 22 November 1879) was a Scottish scientist with interests in magnetism, particularly of the earth, and meteorology. Broun studied in Edinburgh University and worked at the observatory in Makerstoun from 1842 to 1849 before moving to India to work in the Kingdom of Travancore.

Key takeaways

John Allan Broun belongs to physics; place it in that map before memorising details.
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Reproduce the core statement of John Allan Broun from memory before moving on to harder problems.

Reference excerpt

John Allan Broun FRS (21 September 1817 – 22 November 1879) was a Scottish scientist with interests in magnetism, particularly of the earth, and meteorology. Broun studied in Edinburgh University and worked at the observatory in Makerstoun from 1842 to 1849 before moving to India to work in the Kingdom of Travancore. He continued his studies on geo-magnetism in India and was involved in setting up observatories there apart from managing the Napier Museum in Trivandrum. One of the fundamental discoveries he made was that the Earth loses or gains magnetic intensity not locally, but as a whole. He also found that solar activity causes magnetic disturbances.

Early years Broun was born in Dumfries where his father ran a school training students intending to join the navy. Broun was educated at Edinburgh University where he was influenced by James D. Forbes. In 1842, there was an interest in magnetic observations and Thomas McDougall Brisbane established an observatory at his home in Makerstoun, in Scotland and when a director was sought, Forbes recommended Broun who worked there from 1842 to 1849. The observations Broun made at Makerstoun were published in the Transactions of the Royal Society of Edinburgh. Broun suffered heart palpitations, possibly due to extended overnight study. He then hired John Welsh as an assistant. In 1850 he moved to Paris, also marrying Isaline Vallouy, daughter of a priest from Canton du Vaud. Colonel William Henry Sykes recommended Broun for work in India in 1851.

Work in India

From 1852, Broun was director of Trivandrum Observatory, in Trivandrum, in Travancore, India. Trivandrum is today known as Thiruvananthapuram, and is the capital of the Indian State of Kerala, but then it was the capital of the princely state of Travancore, a territory in a subsidiary alliance with British India. The observatory had been founded in 1836 by Swathi Thirunal Rama Varma, the Maharajah of Tranvacore. The first director of the observatory was John Caldecott (1800-1849). The observatory is now part of the University of Kerala, and is one of the oldest of its kind in India. The rulers of Tranvacore during the time of Broun were Uthradom Thirunal (until 1860) and his successor Ayilyam Thirunal. Broun was sent to study geomagnetism at a period when the British Academy was interested in studying it on a global scale. Trivandrum was close to where the magnetic equator lay at the time of Broun. Broun observed large scale pressure changes across India between Shimla and Madras and cyclic variation in magnetic declination. Broun's assistants in Kerala included J. Kochukunju (Cochoocoonjoo) and E. Kochiravi (Cocheravey) Pillai. Broun, while still in India, was elected a Fellow of the Royal Society of London in 1853. He also built an observatory on Agastya Mala, the highest peak in Travancore, and helped to found the museum and zoological gardens. He had a bifilar magnetometer setup on Agastyamalai between 1855 and 1858. This museum was later demolished and replaced by what is now called Napier Museum. The original zoological gardens still survive as Trivandrum Zoo. Trivandrum. Broun suffered from deafness and sickness in India forcing a return to Europe in 1860 and then returned to India to work for three years.

Later career Broun left India for good around 1865, living in Lausanne, Switzerland, and then Stuttgart, Germany, before arriving in London, England, in 1873. He then, with a grant from the Royal Society, worked on analysing magnetic observations made at colonial stations. He also published reports on the Makerstoun and Trivandrum observatories. He was awarded the Keith Medal of the Royal Society of Edinburgh and the Royal Medal of the Royal Society in 1878 for over 35 years of work on magnetism and meteorology.

References

Sources Entry for John Allan Broun in Dictionary of National Biography (1903) A. M. Clerke, Anita McConnell, Broun, John Allan (1817–1879), rev. Anita McConnell, Oxford Dictionary of National Biography, Oxford University Press, 2004 Entry for Broun in the Royal Society's Library and Archive catalogue's details of Fellows (accessed 22 April 2008) History of the University, including the University Observatory, from the University of Kerala

External links Manuscripts of John Allan Broun Archived 2 February 2013 at the Wayback Machine, from the National Library of Scotland John Allan Broun entry at the UK's National Archives History of Trivandrum Museum, with three reports by Broun on the museum, the zoological park and the gardens at Trivandrum "Proposed Institution of Actinometric Observations in India". New Delhi: National Archives of India. 1879. PR_000003043762.

Illustrations

Worked examples

Example 1 — a first encounter with John Allan Broun

Start with the simplest possible case. Write down what John Allan Broun 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 John Allan Broun 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 Allan Broun 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 Allan Broun

In research: John Allan Broun 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 John Allan Broun 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 Allan Broun is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1817 births, 1879 deaths, 19th-century Scottish scientists, so understanding it makes those chapters shorter.
In everyday life: Look for John Allan Broun 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 Allan Broun in 20 minutes

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Frequently asked questions

What is John Allan Broun in simple terms?

Why does John Allan Broun 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 John Allan Broun?

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 Allan Broun.