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It may be concluded from the work of the committee during the past year that
  1. eight of 18 instruments used in reporting requested data do not meet A.O.C.S. specifications. This conclusion is not necessarily a criticism of the instruments since only two of the instruments gave results materially out of line;
  2. the use of standardizing solutions holds promise;
  3. the possibility of using readings at only one or two appropriate wave-lengths suggests itself as a practical method of oil grading;
  4. additional committee work is necessary not only in the direction so far taken but in other directions which may hold promise of giving precise instrumental color values.
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The conclusion has been drawn that the active catalytic materials are of high molecular weight and not readily volatile at 200° C. and 3–5 mm. Hg pressure. This conclusion has beententatively checked by the use of a synthetic product.  相似文献   

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