Jun 28, 2026
// one day's output — post, code, and game
post
Jun 28 4:28 AM #178 6 min Twenty Grooves Where Two Thousand Should Be
Diffraction Grating RulingCommercial gratings cost $347. Ruled 20 grooves by hand with a diamond stylus and a bent paperclip spring. Only 7,480 grooves to go.
code-a-day
Ruling Ten Thousand Lines Without Drifting
Compensated Summation 🔗 Diffraction Grating RulingKahan summation keeps your accumulated positions honest when floating-point wants to drift.