* Photo: Corbis * Getting a perfect diamond or ruby from a raw stone has always been more art than science. Each gem must be meticulously cut and polished by hand. The problem: It can take up to four ...
THE automatic fraction cutter described below is of extremely simple design and inexpensive to make, and yet works as efficiently as any commercial model. In contrast to those which have been ...
WITH increasing use of chromatographic columns, the need has arisen for automatic fraction-cutting apparatus. Stein and Stanford Moore 1 have devised such an apparatus in which the fraction is ...
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