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Thomas Newcomen experimented with steam for 10 years trying to produce a workable machine. His fire machine never quite worked. A stroke of blind luck happened on his last attempt to make it work. The heat from the steam melted the tin-solder. A way for cold water to flow into the lead-case was opened. When the cold water spilled into the cylinder the steam immediately condensed. A vacuum formed pulling the piston to the bottom of the cylinder. It worked. The machine reached its desired effect hitting the hot tin and running again. On the last attempt Newcomen had accidentally discovered a hidden force of nature that made his machine work.