engineering

William Henry Preece

William Henry Preece 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 William Henry Preece rather than just read about it. In short: Sir William Henry Preece (15 February 1834 – 6 November 1913) was a Welsh electrical engineer and inventor. Preece relied on experiments and physical reasoning in his life's work.

Key takeaways

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

Reference excerpt

Sir William Henry Preece (15 February 1834 – 6 November 1913) was a Welsh electrical engineer and inventor. Preece relied on experiments and physical reasoning in his life's work. Upon his retirement from the Post Office in 1899, Preece was made a Knight Commander of the Order of the Bath (KCB) in the 1899 Birthday Honours. That same year, he was elected an International Member of the American Philosophical Society.

Biography Preece was born in Caernarfon (Gwynedd), Wales. He was educated at King's College School and King's College London. Preece studied at the Royal Institution in London (Great Britain) under Michael Faraday. He later was the consulting engineer for the Post Office (1870s). He became Engineer-in-Chief of the British General Post Office in 1892. He developed several improvements in railroad signalling system that increased railway safety. Preece and Oliver Lodge maintained a correspondence during this period. Upon Lodge's proposal of "loading coils" applied to submerged cables, Preece did not realise that "Earthing" would extend the distance and efficiency.

Telegraphy In 1889 Preece assembled a group of men at Coniston Water in the Lake District in Lancashire and succeeded in transmitting and receiving Morse radio signals over a distance of about 1 mile (1.6 km) across water. Preece also developed a wireless telegraphy and telephony system in 1892. Preece developed a telephone system and implemented it in England. A similar telephone system was patented in the United States by Alexander Graham Bell in 1876. In 1885, Preece and Arthur West Heaviside (Oliver Heaviside's brother) experimented with parallel telegraph lines and an unwired telephone receiver, discovering radio induction (later identified with the effects of crosstalk). Preece blocked publication of some of Arthur and Oliver Heaviside's work. There was a long history of animosity between Preece and Oliver Heaviside. Oliver considered Preece to be mathematically incompetent, an assessment supported by the biographer Paul J. Nahin: "Preece was a powerful government official, enormously ambitious, and in some remarkable ways, an utter blockhead." Preece's motivations in suppressing Heaviside's work were more to do with protecting Preece's own reputation and avoiding having to admit error than any perceived faults in Heaviside's work.

Radio In 1897, with Marconi radio experiments from Lavernock Point in south Wales to the island of Flat Holm, Preece became one of Marconi's most ardent supporters. He made various efforts to support Guglielmo Marconi in the wireless field. Preece gained financial assistance from the Post Office to help expand Marconi's work. Preece believed incorrectly that the Earth's magnetic field was critical in the propagation of radio waves over long distances. He had a long-standing rivalry with Oliver Heaviside over his understanding of electricity. It was derisively referred to as "the drain-pipe theory" by Heaviside, because Preece relied on an analogy between electricity and water for thought experiments. Reportedly, he rejected and never understood James Clerk Maxwell's advances to mathematical physics, and insisted that adding inductance to a telegraph line could only be detrimental, even while Maxwell's and Heaviside's theory and experiments showed that inductance could help. Preece once stated, conveying sentiments later expressed by Edwin Armstrong,

True theory does not require the abstruse language of mathematics to make it clear and to render it acceptable [...] All that is solid and substantial in science and usefully applied in practice, have been made clear by relegating mathematic symbols to their proper store place – the study. Preece served as president of the Institution of Civil Engineers between April 1898 and November 1899.

References

Further reading E. C. Baker, Sir William Preece, F.R.S., Victorian Engineer Extraordinary (London: Hutchinson, 1976) ISBN 0-09-126610-6

External links

Russell Naughton, "Adventures in CyberSound: Preece, William Henry". "100 Welsh Heroes / 100 Arwyr Cymru", 73. Sir William Henry Preece Archived 25 October 2018 at the Wayback Machine, Groundbreakers. Culturenet Cymru, 2004. Oil on canvas painting by Beatrice Bright of Sir William Preece

Illustrations

Worked examples

Example 1 — a first encounter with William Henry Preece

Start with the simplest possible case. Write down what William Henry Preece 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 William Henry Preece 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 William Henry Preece 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 William Henry Preece

In research: William Henry Preece 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 William Henry Preece 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: William Henry Preece is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1834 births, 1913 deaths, 19th-century Welsh engineers, so understanding it makes those chapters shorter.
In everyday life: Look for William Henry Preece 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 William Henry Preece in 20 minutes

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

Frequently asked questions

What is William Henry Preece in simple terms?

Sir William Henry Preece (15 February 1834 – 6 November 1913) was a Welsh electrical engineer and inventor. Preece relied on experiments and physical reasoning in his life's work.

Why does William Henry Preece 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 William Henry Preece?

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 William Henry Preece.