PROF. KARL PEARSON has kindly referred me for a simple graphical construction for any positive or negative power of any rational quantity whatever to Egger's “Grundzüge einer graphischen Arithmetik.” ...
CAPT. H. BROCARD (of Montpellier), writing to me on the subject of my note in last week's NATURE (p. 539), communicates the following two simple constructions:— ...
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