Wheel or jenny?
Output per worker
Spin the wheels!
Turn each machine. Which makes more thread for the same effort?
One worker, one wheel: compare a single spindle with the jenny's eight.
Tap the buttons. Which one makes more thread?
Your turn
Each lab is one step from the video. Turn, slide and switch, and see why the machines took off in Britain.
Each lab isolates one idea. The wage and price models are qualitative (after Robert Allen); see the notes.
Tap and slide, and watch what happens.
Turn each machine. Which makes more thread for the same effort?
One worker, one wheel: compare a single spindle with the jenny's eight.
Tap the buttons. Which one makes more thread?
Drag the years from 1450 to 1600. When does wood get dearer than coal?
Relative cost of the same heat, coal = 1. By about 1600 wood cost roughly twice as much.
Slide it. Which one costs more?
Illustrative shape after Robert Allen: wood and coal about equal in the 1400s, wood about twice coal by around 1600.
Put Britain, France and China on the scale, or set your own wages and coal price.
Allen's argument as a balance: when does a labour-saving machine pay for itself?
A qualitative model after Robert Allen, not real prices. Other historians stress culture, institutions and politics.
Run the engine, then switch on the condenser. Watch the coal pile.
With the separate condenser, the same work takes about a third of the coal.
Press run. Then tap the cooler. Less coal!
Pick a country, or switch the ingredients on and off. What does it take to catch fire?
Toggle the factors. The model is deliberately simple: only the full combination ignites.
Simplified: France and China lacked Britain's cheap coal and high wages (Allen), and France's revolutionary years discouraged investment (Britannica).
Tap the years to watch Manchester grow.
Circle area ∝ population (1911 is capped: the metropolitan area).
Tap the buttons. Watch the town grow!
Long ago, almost everything was made by hand. People spun cotton into thread on a spinning wheel, one thread at a time.
Then people in Britain built machines, like the spinning jenny. One person could make lots of threads at once. This big change is called the Industrial Revolution.
People burned so much wood that it started to run out. Britain had lots of coal under the ground, and it was cheap. Coal is a black rock that burns hot.
A man called James Watt made the steam engine much better. It used much less coal. Steam engines could turn the wheels in big factories.
Towns grew very fast. Factory work was hard, and even children worked very long days. The air was full of smoke. People worked to change the rules, and slowly new rules stopped young children working in factories.
The Industrial Revolution was the change from an economy of farming and handmade goods to one run on machines, factories and coal. It began in Britain in the 18th century, roughly 1760 to 1840, and then spread around the world.1
It started in Britain because several ingredients came together there first. None of them was enough on its own:23
This is the big question, and historians still argue about it. One of the most influential answers comes from the economic historian Robert Allen. His argument goes like this.2
Trade and fast-growing cities had pushed British wages to the highest in the world. Only the Low Countries (today's Netherlands and Belgium) came close. In much of Europe and Asia, most workers earned just enough to survive.2 At the same time, Britain had the cheapest energy in the world on its coalfields. Energy cost more across Europe and far more in China.2
Now picture a business owner. A machine costs money and burns fuel, but it saves on wages. In Britain, where workers were expensive and coal was cheap, the machine paid for itself. Where workers were cheaper and fuel was dearer, many of these machines were much less attractive.23 Allen points to the spinning jenny. By the late 1780s England had over 20,000 jennies and France only about 900.2 In his words, Britain "was also the only country where it paid to invent" these machines.2
Not everyone agrees on how much weight to give each factor. Other historians put more stress on religion and culture, on science and the Enlightenment, on politics and stable government, or on empire.23 Most agree that Britain's clever inventors weren't the whole story. Genius wasn't unique to Britain; what was unusual was that inventions got used there.3
| Ingredient | Britain in the 1700s | Why it mattered |
|---|---|---|
| Energy | Cheap coal on big coalfields near water3 | Machines could run cheaply |
| Labour | High wages2 | Labour-saving machines paid off |
| Food and people | Better farming, growing population4 | More workers for towns and factories |
| Money and ideas | Investors, low interest, patents, political stability3 | Inventors could get funded and protected |
| Trade | Colonies and trading posts in North America, the Caribbean and India3 | Raw cotton in, a huge market for goods out |
| Transport | Coast, rivers, canals, later railways39 | Heavy coal and goods moved cheaply |
The story begins with fuel. As London grew, people burned so much wood that forests shrank and firewood got scarce.4 In the 1400s, wood and coal cost about the same in London for the same amount of heat. By around 1600, firewood and charcoal cost about twice as much as coal.2 So Londoners switched. They built houses with narrow fireplaces and chimneys for burning coal, and coal was shipped down the coast from Newcastle.2 By the end of the 1600s, Britain's switch to coal was more or less complete.4
Britain also had iron ore, lead, copper and tin, and centuries of mining know-how.3 Iron makers learned to smelt iron with coke (a coal product) instead of charcoal, which proved a big help for making iron.4
Cotton led the way. Before the machines, families spun and wove cloth at home, a system called the cottage (or domestic) industry.4 Around 1764, a Lancashire weaver named James Hargreaves came up with the spinning jenny, a hand-powered machine that let one person spin several threads at once. He patented it in 1770.5 Hand spinners were afraid of losing their jobs and broke into his house to smash the machines.5
Richard Arkwright, a former wig-maker, patented the water frame in 1769. It was driven by a water wheel and made stronger cotton thread than the jenny. Arkwright's real breakthrough was organising the work in factories. By 1782 he employed 5,000 workers.6
Steam engines already existed. Thomas Newcomen's first recorded engine was built in 1712, near Dudley Castle, to pump water out of mines.7 It worked, but it wasted fuel, because its cylinder was heated and then cooled on every stroke.
In 1764, James Watt, a Scottish instrument maker, was repairing a model Newcomen engine and noticed how much steam it wasted. In May 1765 he hit on the answer: condense the steam in a separate condenser, so the main cylinder could stay hot.8 His 1769 patent is one of the most important ever granted in Britain. Engines with his condenser burned about two thirds less coal, so they could be used in factories, mills and workshops, not just at mines.10 Watt teamed up with the businessman Matthew Boulton in 1775. Their first two engines were installed in 1776, and later made them turn wheels for mills.8
That changed where factories could go. Water wheels needed a fast river. Steam engines needed coal and some water, but not a fast river to turn a wheel, so factories could be built in towns.4 Engineers kept improving the engines. Coal use fell from about 45 pounds per horsepower-hour in the early 1700s to about 2 pounds by the mid-1800s.2 By 1840, British steam engines produced 620,000 horsepower, out of 860,000 in all of Europe.11
Coal is heavy, so moving it cheaply mattered. The Bridgewater Canal, finished in 1761, carried coal from the Duke of Bridgewater's mines to Manchester and cut the price of coal there in half.9 On 27 September 1825, George Stephenson's Locomotion pulled the first train on the first public steam railway, from Darlington to Stockton, carrying 450 people at 15 miles per hour.12 The Liverpool to Manchester line followed in 1830.11
Britain's trade network reached North America, the Caribbean and India. The country made vast amounts of money from colonial trade in raw materials, manufactured goods and enslaved people. Some of that money was invested in new technology, and the empire became a huge market for British cloth and machinery.3
The cotton itself came largely from plantations worked by enslaved people. After the cotton gin was invented in the United States in 1793, cotton growing expanded in the U.S. slave states, which became a key supplier to British mills.413 The machines in Lancashire depended on forced labour across the Atlantic. That is a real part of the story.
Once it got going, the Industrial Revolution changed where people lived, how they worked and how long they lived with smoke and noise.
Manchester is the classic example. In 1717 it was a market town of about 10,000 people. By 1851, thanks to cotton, it had more than 300,000, and by 1911 the wider city had about 2,350,000.14 Across Britain, about 20% of people lived in towns in 1800. By the mid-1800s, it was about half.15
| Year | Manchester's population |
|---|---|
| 1717 | about 10,000 (a market town) |
| 1851 | more than 300,000 |
| 1911 | about 2,350,000 (the whole metropolitan area) |
In the old domestic system, workers owned their tools and chose their own hours. In the factory system, the employer owned the machines and set the hours and rules.16 Work followed the pace of the steam engine. Hours were very long and conditions were often dangerous.15
Women and children made up much of the workforce in cotton mills. They were paid little and routinely worked 16 hours a day or longer.15 Reform came slowly. The 1833 Factory Act covered textile mills: it banned work there for children under nine, limited 9 to 13 year olds to nine hours a day and 13 to 18 year olds to twelve, required two hours of schooling a day, and appointed four inspectors to enforce it. Even then, many factories broke the rules.17
Towns grew faster than housing and sewers could keep up. Many workers lived in crowded, unsanitary homes.116 Coal smoke polluted the air; Manchester's sunshine was noticeably reduced during its industrial boom.14 Some skilled hand workers fought back. From 1811, bands of Luddites smashed the textile machines that were taking their jobs.18
At first, the Industrial Revolution seemed to make workers poorer. Over time, though, new ideas, inventions and laws gave people more goods and let them travel and communicate faster.1 Wages rose and new jobs were created.3
From 1760 to 1830 the Industrial Revolution was mostly confined to Britain, which even banned the export of machines and skilled workers. It didn't last. Belgium was next, around 1807. France was slower, partly because the French Revolution discouraged big investments. Germany took off after it united in 1871, and by 1900 it made more steel than Britain. Industry also grew in the United States during the 1800s, and in Japan later in the century.1 British engineers kept making machines more efficient, and eventually they paid off even where coal was dear or labour cheap.2
Britain had several things at once: lots of cheap coal, well-paid workers (so machines that saved labour were worth buying), inventors and investors, patents, better farming, colonies and trade that supplied cotton and markets, and rivers and canals to move heavy goods. These advantages came together in Britain first, though historians debate which mattered most.
A common short list is: cheap energy (coal), new technology (textile machines and the steam engine), changes in farming that fed a growing population and freed workers, and money from trade and empire to invest. Many historians also stress high British wages, patents and good transport.
It began in Britain around 1760. The historian Arnold Toynbee used 1760 to 1840 for Britain; many historians use roughly 1750 to 1850. It then spread to Belgium, France, Germany, the United States and Japan during the 1800s.
No. Thomas Newcomen's engine was pumping water from mines by 1712. In 1765 James Watt invented the separate condenser, patented in 1769, which cut coal use by about two thirds and made steam power practical for mills and factories.
People moved from the countryside into fast-growing towns like Manchester, and work moved from homes into factories with fixed hours. Early factory life brought long hours, child labour, crowded housing and smoky air. Over time, laws such as the 1833 Factory Act and new goods and transport raised living standards.
One influential answer (from historian Robert Allen) is that lower wages and dearer coal made many of the new machines much less worth buying there. By the late 1780s France had about 900 spinning jennies, against England's 20,000. Other historians add politics, culture and institutions.
Historians talk about a second Industrial Revolution (steel, electricity, chemicals, from the late 1800s), and some people call today's digital and AI changes a third or fourth. Factories and machines still make most of what we use, but many more people now work in services.