Improved methods for the measurement of spectral line intensities have been developed. Such techniques are based on the authors' modification of the partial Seidel function, referred to as B-functions. A conversion table for these is given. A scale calibrated in B-functions has been incorporated into a Hilger microphotometer enabling such values to be obtained directly without the use of conversion tables. B-values can be plotted directly on to the linear co-ordinate of semilog graph paper if the self-calibration method is used for evaluating line intensities, there is an attendant time saving and improvement in the accuracy of background extrapolation. A nomographic technique developed for use in conjunction with this scale, results in a rapid evaluation of line intensities but with some loss of precision. It is concluded that the technique will result in an improvement of some existing photometric methods.

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