new lines of research, their hard-working methods in as the second slit was set directly on the center of lines. Consequently, Prof. Hale desired greatly to observing, and their genius in properly interpreting learn what would be the results when the Ha line of the K line or a little to the red or… … success until within the last year. star, and in closely studying it Photographs Showing the sunspot on May 29 and June 2, 1908. Mr. Robert James Wallace of the we are not only gaining informa- Yerkes Observatory showed a Note the long, dark mass of hydrogen and the marked whirling structure. tion…
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