Joe Desbonnet has an interesting take on an excerpt from the book Inventing Accuracy about the future-prediction in 1873 by Joseph John Murphy of inertial measurement units (and subsequently later of MEMS gyroscopes) – components now small enough to fit inside your and my smartphones.
If a ball is freely suspended from the roof of a railway carriage it will receive a shock sufficient to move it, when the carriage is set in motion: and the magnitude and direction of the shock … will depend on the magnitude and direction of the force with which the carriage begins to move…
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