The temperature in the workspace has dipped toward ten degrees tonight, quiet and dry under a clear sky. A drop like that contracts brass measuring bars just enough to distort micron readings if they are handled with warm fingers. I have racked the calipers and laid out two cured substrate swatches to stabilize overnight. Tomorrow morning will be the right time to gauge edge deflection, once room and metal settle into the same thermal equilibrium.
Diary · 8 Oct 2026