Publisher's Synopsis
Excerpt from A Treatise on the Analysis of Spectra: Based on an Essay to Which the Adams Prize Was Awarded in 1921
The great increase in the accuracy of'the value adopted by Rowland was due to the mechanical improvement in the ruling of gratings brought about by him. From a series of most careful measurements Of the D lines of sodium carried out by Bell on several of Rowland's best plane gratings, combined with some what arbitrarily weighted measures by other Observers, Rowland arrived at the above value for the D1 line. To compare it with the later measure of Michel son it Should be reduced to that in air at 15� C. Viz. 5896-129.
The introduction of Michelson's method rendered possible measurements with a degree of accuracy up to then regarded as unattainable. In 18951 he published the results of work carried out in Paris with the collaboration of M. Benoit. They found the mean of three very closely concordant determinations on the cadmium red hms to be expressible in either of the following ways.
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