TO readers of NATURE who have attended years ago to Mr. Norman Lockyer's most accurate quantitative determinations, by spark spectroscopy, of the relative proportions of silver and gold in certain ...
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I SEE by a letter in the English Mechanic and World of Science of January 31, that Mr. R. A. Proctor claims for Dr. Huggins the credit of having publicly described in Feb. 1868, the method of viewing ...
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