Which mechanical interaction enabled early mechanical clocks (pre-1600s) to achieve stable oscillation despite variations in drive force?

💡 Explanation

When driving force fluctuates, the verge and foliot escapement regulates the release of energy from the mainspring by impulsing the foliot, maintaining consistent oscillatory motion despite variations in the driving force. Therefore, stable oscillation is achieved, rather than constant force (fusee), isochronism (balance spring), or speed reduction (worm gear).

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