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Important new booklet Now, for the first time in the dynamic his tory of modern chromatographic analysis, you can have a complete listing of instru ments and accessories in one handy volume.
REPORT
rors of the analysis are, and then submits four samples, three of which are identical and the fourth differs from them by about one standard deviation, and asks the analyst to pick out the maverick on the basis of one analysis per sample. ASTM cooperative samples are usually "loaded" in this fashion. Minimizing Laboratory Operating Costs
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If you are worried about the costs in your laboratory operation, a statistically determined formula shows how to minimize sampling and analytical costs for a specified over-all variability. Although this article is supposed to be nontech nical in the sense of trying to teach statistics, this one formula is given. It is η = — W-r where η is the
Catalog 84 INSTRUMENTS for e a s and Vapor Chromatography
BURRELL
Only Burrell builds a complete series of laboratory instruments for chromatographic analysis, including four models of the versatile Burrell Kromo-Tog for research or process control. Request Catalog 84
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Scientific Instruments and Laboratory Supplies
BURRELL CORPORATION, 2223 FIFTH AVENUE, PITTSBURGH 19, PA. Circle No. 28 on Readers' Service Card ANALYTICAL CHEMISTRY
