How Pinwheel Calculators Work
Why the open web links it
Explains the mechanical operation of 19th-century pinwheel calculators using visual demonstrations and historical context.
Linked by 4 independent sites, 2 of them widely read in the 2026-10 crawl of the open web, including usal.es, htw-berlin.de, clatteringeast.com, thomas-kirchhof.de.
Cited in 1 Wikipedia article, including Pinwheel calculator.