E.4 Technological Evolution

The Industrial Revolution in Britain, roughly 1760 to 1840, gets extra time here: steam power and mechanized textiles multiplied output within a few generations, and a second wave after 1870 added electricity and the internal combustion engine. Watt's steam engine, the railways, and Bessemer's cheap steel are the standard landmarks. Interchangeable parts are usually credited to Eli Whitney, but the credit is mostly legend: his 1801 demonstration was staged, and the real achievement, parts precise enough to swap between finished products, came from Honoré Blanc in France in the 1780s and then John H. Hall at the federal armory at Harpers Ferry in the 1820s. Ford's moving assembly line (1913) depended on it. For the human cost, read a chapter of Andrew Ure's Philosophy of Manufactures (1835), which defends the factory system, against Marx's Capital, which quotes Ure mostly to attack him.

After the telegraph and telephone, the twentieth century added aviation and computing, from vacuum tubes to transistors to microprocessors. Isaacson's The Innovators tells the computing story as collaboration, from Ada Lovelace to Turing to Silicon Valley. The internet runs through ARPANET, Vint Cerf and Bob Kahn's TCP/IP, and Tim Berners-Lee's Web, a change sometimes called a Digital Revolution on the scale of the first industrial one.

Whether technology drives history or society shapes which technologies win is an old argument, and the stirrup is the textbook example on both sides. Lynn White argued in 1962 that the stirrup enabled mounted shock combat and reshaped medieval European society; critics, starting with P. H. Sawyer and R. H. Hilton in Past & Present (1963), showed that the chronology does not support it. Read White's argument and the case against it. The same question recurs for automation, privacy, and AI deployed faster than anyone can evaluate it; Brynjolfsson and McAfee's The Second Machine Age is one entry point.