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My Weird Prompts · October 12 · 25 min

Gears That Did Calculus: Mechanical Computers

Before electronics, gears and cams were doing calculus. This episode traces mechanical computing from the Antikythera mechanism — a shoebox of bronze gears that predicted eclipses — through Vannevar Bush's room-filling differential analyzers and the three-thousand-pound Ford Mark One that aimed battleship guns into the 1990s. Along the way: how a gear ratio becomes an equation, why the moon forced ancient engineers into epicyclic gearing, what a spinning disc integrator actually computes, and the surprising ways analog computing is still alive today doing things digital machines can't. Key sources: • *Nature* 598, 39 — https://www.nature.com/articles/s41586-021-03623-y • *Nature Communications* 10:882 (2019), Additively manufacturable micro-mechanical logic gates — https://www.nature.com/articles/s41467-019-08678-0 • Wikipedia, Mark I Fire Control Computer (accessed 2026-10-12) — https://en.wikipedia.org/wiki/Mark_I_Fire_Control_Computer Episode 5887 — myweirdprompts.com/n/5887 (permanent short link: myweirdprompts.com/981702)

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Before electronics, gears and cams were doing calculus. This episode traces mechanical computing from the Antikythera mechanism — a shoebox of bronze gears that predicted eclipses — through Vannevar Bush's room-filling differential analyzers and the three-thousand-pound Ford Mark One that aimed battleship guns into the 1990s. Along the way: how a gear ratio becomes an equation, why the moon forced ancient engineers into epicyclic gearing, what a spinning disc integrator actually computes, and the surprising ways analog computing is still alive today doing things digital machines can't.

Key sources:
• *Nature* 598, 39 — https://www.nature.com/articles/s41586-021-03623-y
• *Nature Communications* 10:882 (2019), Additively manufacturable micro-mechanical logic gates — https://www.nature.com/articles/s41467-019-08678-0
• Wikipedia, Mark I Fire Control Computer (accessed 2026-10-12) — https://en.wikipedia.org/wiki/Mark_I_Fire_Control_Computer

Episode 5887 — myweirdprompts.com/n/5887 (permanent short link: myweirdprompts.com/981702)

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