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In the 1880s, workers inside a blacksmith workshop witnessed something they could not explain. Long after the forge had cooled and the belts stopped moving, a massive power hammer began to twitch — lifting and dropping just slightly, as if something unseen were pulling it. Some believed it was sabotage. Others feared a mechanical failure. A few whispered that the old hammer was “alive.” But decades later, engineers uncovered the real cause: a rare and dangerous mix of harmonic vibrations from nearby mills, latent tension stored in the hammer’s spring arm, pressure pockets forming inside the cylinder, and structural resonance traveling through the workshop floor. A set of conditions so specific that it fooled an entire crew into believing a machine was coming to life. This is the true story of the hammer that swung by itself — and why the machines of the Industrial Age often behaved in ways their builders never expected.