THIS is a good elementary text-book, founded on the work by M. E. Lagout (“Takimetry”), which we have already noticed (NATURE, vol. xvi. p. 226). The ground covered by the work before us is not quite ...
DR. JEFFREYS (NATURE, April 28, p. 267) claims that “experimental geometry” is a contradiction in terms. I protest vehemently. “Geometry” means the measurement of the earth. How can you measure the ...
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