What physical principle did Stephen Holland utilize in his 1698 design for a speedometer?

Answer

Measuring the rate at which a vessel displaced water as the vehicle moved

Stephen Holland's earliest known design utilized a water-based mechanism that measured the rate at which the moving vehicle displaced water.

What physical principle did Stephen Holland utilize in his 1698 design for a speedometer?

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Frank Jansa and the history of the speedometer and odometer by ...

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