Did the steam engine cause the Industrial Revolution?

The short answer

• Coal close to towns and the sea. Britain’s coal seams lay near navigable rivers and the coast, so coal could reach customers by water long before railways existed. Tyneside had shipped coal to London since the Middle Ages, and the Midland and Lancashire fields lay beside growing towns. By 1800 Britain mined about 15 million tons a year. That accessibility made coal cheap where it was needed, and cheap coal made the machines that burned it worth inventing.
• Flooded mines demanded engines. As miners dug deeper, water became the limit on the output of coal and metal, and horses or water wheels could not pump it out fast enough. The inventor Thomas Newcomen’s atmospheric engine of 1712, worked by air pressure on a piston, solved the problem for coal mines, where waste coal was free, and by 1800 hundreds worked across Britain. Cornish copper and tin mines, far from any coalfield, needed something more efficient, and that need created the first market for the engineer James Watt’s improved engine.
• Skilled hands and patient capital. The engineer James Watt’s separate condenser, a chamber that cooled the steam outside the cylinder, became a working engine only because skill, money and legal protection came together around it, beginning with the accurate cylinders that the ironmaster John Wilkinson bored from 1775 on a machine he had patented in 1774 for cannon. Birmingham’s metalworkers supplied the parts, and the manufacturer Matthew Boulton supplied capital, a factory and a gift for selling. An Act of Parliament in 1775 extended Watt’s patent to 1800, giving the partners twenty-five years to recover their investment. Behind every famous inventor stood the craftsmen, investors and lawmakers who turned an idea into a product.
• Cotton and war created demand. The new cotton mills wanted reliable power, and the wars with France between 1793 and 1815 wanted iron for cannon, shot and ships. Government contracts and wartime prices pushed ironworks owners such as the Crawshays of Cyfarthfa, in South Wales, to expand, while mill owners who had outgrown their streams turned to steam. Each new industry became a customer for the next, which made the expensive new technologies worth adopting. Demand set the timing of change, because an invention spread only once enough buyers needed what it could do.

What it changed

Locomotives grow out of colliery engines. High-pressure steam engines, light enough to move themselves, were first put on rails at collieries, or coal mines, and ironworks. The Cornish engineer Richard Trevithick ran a locomotive at Penydarren near Merthyr in 1804, and colliery engineers on Tyneside, among them George Stephenson, built locomotives to haul coal wagons. Chapter 4 follows their engines from the coalfields to the first public railways. Within about forty years the colliery locomotive had grown into a national transport system, because an engine built to haul coal could carry goods and people just as well.

Industry gathers on the coalfields. Because coal was heavy, the industries that burned it moved to it. The textile towns of Lancashire and Yorkshire, the iron towns of South Wales and the shipbuilding towns of the north-east all stood on or beside coalfields, and so did the Black Country, a metalworking district west of Birmingham named for its smoke. Chapter 5 follows the towns they became. The map of coal had turned into the map of where Britons lived and worked.

The continent copies the model. Belgium’s coal belt from Mons to Liège, the Ruhr valley in western Germany and Upper Silesia, now in Poland, repeated Britain’s pattern of coal, iron and canals, often with British machines and engineers. On the map Belgium and Switzerland are already shaded as industrialising by 1820, and chapter 7 follows how the continent learned from Britain and where it chose a different path. Coal decided where heavy industry could grow, on the continent as in Britain, while coal-poor Switzerland industrialised on water power and skill.