fayescarlet: aibohphobia: mr-egbutt: thefurrynerd: cutlerish: thelynnfiles: logically-devonian: How the Geneva Drive (the mechanical step that makes the second hand on a clock work by turning constant rotation into intermittent motion) works.
from: https://www.tumblr.com/blog/view/itspronouncedguy-care/132542696729
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