Wikipedia says that in 1817, Henry Kater was able to measure distances accurately enough to get at least five significant figures in a measurement of $g,$ suggesting that he could measure a distances on the order of one meter to an accuracy of one hundredth of a millimeter. Indeed, Wikipedia claims he made this measurement to an accuracy of $2.5 \;\mathrm{\mu m}.$

This would be an absolute distance measurement, not detecting changes in distance (as one would do with an interferometer). How did Kater achieve this accuracy?


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.