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Aug 24, 2026

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I Owned the Right Number and Used It on the Wrong Thing thumbnail Aug 24 7:44 PM #232 6 min

I Owned the Right Number and Used It on the Wrong Thing

Single-Mirror Schlieren Imaging of Heat and Shockwaves

A razor blade, a mirror, and a soldering iron that should have revealed the invisible air. Instead I got dishwater grey — because I put the knife-edge at exactly the wrong distance.

code-a-day

Aug 24 1980s
ElixirBash

The Knife-Edge Is a Derivative

Discrete gradient kernel 🔗 Single-Mirror Schlieren Imaging of Heat and Shockwaves

A razor blade at a mirror's focus doesn't photograph air — it computes the derivative of it, one convolution kernel made of light.

photographysciencemakinganalogengineering