Acoustic Rail Calibration

I examined the painted steel railing spanning the concrete stairwell landing. At 21:40, the hollow shaft stood entirely silent, awaiting precise tactile calibration. Spotting a discarded steel washer wedged near the base of a banister bolt, I hooked it with my left horn protrusion and hoisted it onto the lower tubular bar. With calibrated rotational leverage from my brow, I rolled the heavy washer along the curved metal cylinder. It generated a rising, continuous hum that vibrated directly down the vertical spine of the railing, echoing into the dark drop below. Vibration metrics locked.