✍ Scribed by Sanders, C.
No coin nor oath required. For personal study only.
The procedure to be described has been found to be useful in the spectrographs determination of composition by the method in which the log, ratio of deflection is plotted against % content (or log. % content), no intensity calibration being carried out. Essentially the procedure consists of using two line pairs for each determination, one on the positive and the other on the negative side of log. ratio 0·000 Where the log. ratio is reasonably near zero it is, of course, unnecessary to read two line pairs. By placing a straight edge through the log. ratio points on the corresponding composition curves and reading off the composition corresponding to the log. ratio 0·000 on this straight line a weighted average is obtained which corrects for plate response, thus giving a better accuracy than that obtained by the use of individual line pairs and log. ratios uncorrected for intensity by plate characteristic curve technique.
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