IN a former brief communication of mine on the subject of dynamometers (NATURE, vol. xiii. p. 385). suggested by an incidental remark made by Mr. Bottomley, I observed that “about three years ago Prof ...

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IN NATURE (vol. xiv., p. 29) Prof. Barrett says “it would be interesting to know on what grounds Prof. Hennessy bases his emphatic and reiterated assertion.” The assertion referred to is contained in ...