Abstract
A SYMPOSIUM on micro-chemical analysis arranged by the Micro-Chemical Club, the South Yorkshire Section of the Royal Institute of Chemistry and the Sheffield Metallurgical Association was held at Sheffield on October 9, and was preceded by a demonstration of micro-chemical methods and an exhibition of micro-chemical apparatus. The exhibition was very complete in character and included the latest design of micro-chemical balance, capable of weighing one milligram of substance accurately to 1/500 mgm., some physical instruments now used as the tools of the micro-chemist-notably the polarograph and photo-electric absorptiometer- and a variety of graduated flasks, pipettes, burettes and mixing vessels. Of the micro-glassware exhibits one of the most interesting was the Wigglesworth-type burette which was used in the determination of the sodium chloride content of the body fluid of a, single gnat. This burette is usually home-made by 1-' the micro-chemist, being obtained by drawing out a piece of glass tube to an extremely fine bore, waxing the interior and exterior surfaces and mounting in a suitable glass tube. The waxing overcomes surface tension effects, a drop size something less than that of the head of the average pin is obtained, and each drop breaks cleanly away from the burette end.
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VAUGHAN, E. DEVELOPMENTS IN MICRO-CHEMICAL ANALYSIS. Nature 152, 555–556 (1943). https://doi.org/10.1038/152555a0
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DOI: https://doi.org/10.1038/152555a0
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