James Watt patents the separate condenser
Scottish engineer James Watt was repairing a Newcomen engine model at Glasgow University when he realized that nearly all the engine's energy was wasted heating and cooling the same cylinder over and over. His 1769 patent for a separate condenser — letting the cylinder stay hot and the condenser stay cold — roughly tripled fuel efficiency. Combined with the rotative motion he developed in 1781, Watt's engine could power not just pumps but also factories, looms, and (eventually) locomotives. Within a generation, 'horsepower' was a meaningful unit. Within two, Britain had the world's only mechanized economy.
Watt's patent was extended to 1800 by an Act of Parliament — an unusually long monopoly that historians have argued may have actually slowed the diffusion of steam power for two decades, since improvements that infringed Watt's patent could not legally be commercialized. Once the patent expired, British steam-engine output and efficiency both rose sharply.
02 · King Coal
Once Watt's steam engine made coal-to-motion practical at scale, every breakthrough in industrial production rode on top of it: railways, steamships, mechanized factories, telegraph wires, electrical grids. Britain sat on the largest accessible coal reserves in Europe, and that geological accident turned a small Atlantic kingdom into the world's first industrial empire. By 1850, Britain produced more iron than the rest of the world combined. By 1908, it produced 25 percent of the world's coal. Wealth concentrated in factory owners, railway financiers, and shipping magnates — a new merchant aristocracy whose money came from burning rocks.
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