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AN absolute determination of the acceleration due to gravity at a site in the National Physical Laboratory has recently been completed. It is the first to be made by timing the symmetrical up-and-down ...
Dated and signed at end: June 16th, 1880 W.E. Ayrton, John Perry. "From the Philosophical Magazine for July 1880." No. 24 in a vol. of articles mainly by Ayrton and ...