Abstract
All scientific workers who have had occasion to make use of monochromatic light sources have doubtless had the experience that one type of source gives suitable results in some cases and not in others. The writer believes, however, that the device here described possesses sufficient merit in point of compactness, ease of manipulation, and in the results obtained, to warrant attention being called to it as an aid to others engaged in the type of work for which it is adapted and as a possible aid in other lines.
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