What the timing machine hears

A movement is not timed once. It is timed lying down, standing on each edge, and hanging from the wrist's usual angles, because a balance wheel does not forget gravity when the case changes position.

The timing machine listens to the escapement's own sound, translates each tick and tock into a line, and reads the gap between them. A movement running true shows a flat line. A movement running fast or slow shows a line that leans, and the lean is corrected at the balance, not disguised at the crown.

Six positions, six lines, one adjustment repeated until all six agree within the stated rate. The seventh reading is the confirmation: the same six positions, checked again, to prove the adjustment held rather than shifted the argument somewhere else.

A watch that passes on the bench and drifts on the wrist has not been timed. It has been guessed at. The machine exists so nothing here is a guess.