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Updated: April 30, 2025
Professor Roberts-Austen, the Chemist to the Mint, has also employed it with success in analysing the purity and temper of coins; for, strange to say, the induction is affected as well by the molecular quality as the quantity of the disturbing metal. Professor Hughes himself has modified it for the purpose of sonometry, and the measurement of the hearing powers.
W.C. Roberts-Austen, says the Engineer, remarks that the importance of the isomeric and allotropic states has been much neglected in the case of metals.
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