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VOl. 29 Automated analysis of nitrogenous compounds 89 some gross errors in a simple graph-reading exercise in which the readers were aware that the results were to be analysed for correctness. On the whole the gain in precision in going from the non-linear, hand-drawn chart technique (where the main error is probably in absolute accuracy) to the semilog computed standard curve is fairly small, but the importance of precision was shown to us in our routine laboratory serum calcium estimations,doi:10.1079/pns19700017 pmid:5536326 fatcat:nlm6ljmqxrdv5iwzsug5a2stby