. Carnegie Institution of Washington publication. wind-shield. Thus the requisite steadiness has been secured, in spite of the great height of the structure. In other re- spects the new tower is also a decided improve- ment, adding still fur- ther to the sharpness of the solar image during the warmer hours and thus increasing the du- ration of the period of observation, which with this telescope lasts throughout the day. The opening up of the various new fields of solar research taxes the capacity ot all three telescopes, each of which is devoted to the work for which it is best adapted. A fea
. Carnegie Institution of Washington publication. wind-shield. Thus the requisite steadiness has been secured, in spite of the great height of the structure. In other re- spects the new tower is also a decided improve- ment, adding still fur- ther to the sharpness of the solar image during the warmer hours and thus increasing the du- ration of the period of observation, which with this telescope lasts throughout the day. The opening up of the various new fields of solar research taxes the capacity ot all three telescopes, each of which is devoted to the work for which it is best adapted. A feature of the new tower telescope, which is quite as important as the enlarged solar image, is the spectrograph,now extended to a focal length of 75 feet and mounted in a deep well. J rt FIG. 31.—Section of Tower Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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