Two Facts That Cored the Apple
from The Slow Machine
In the 1850s, the British survey of India recorded an error it could not explain. The Himalayas — the biggest mountains on Earth — were not pulling their weight. Episode 3 of The Slow Machine is about the two discoveries that wrecked nineteenth-century geology, and neither was made by a geologist. A half-ton brass theodolite, hauled up Indian hillsides so an empire could tax its territory, which revealed that mountains float. A drawer in Paris, a cloudy week and a fogged photographic plate. An instrument built to study squeezed crystals, turned on uranium ore. And a lecture at the Royal Institution in 1904, where a young physicist looked up and saw the most famous scientist in Britain in the audience. The Slow Machine is a nine-part series on how we found out that the continents move, and why almost every clue came from an instrument built for something else entirely. Next time: Episode 4, "The Weatherman" — a torn newspaper, glacial scratches in the tropics, and the most comprehensively demolished good idea of the twentieth century. — Guest voices: Jon W (George Airy), found on Fiverr, and John Cowan (Ernest Rutherford), who generously donated his recording. Every quotation is listed with its source on this episode's page at theslowmachine.com. Written and narrated by Michael Goddard. Music composed with Suno. Sound effects from freesound.org, all Creative Commons 0. Every voice in this series is human.
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