By R. R. Mcmath, O. C. Mohler (auth.), S. Flügge (eds.)

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Unsteady images can be stabilized through the use of additional photoelectric servo-mechanisms 4 • Another method attempts to circumvent the difficulty by reducing the time required to make an observation. Recordings are made at very high speed with the aid of oscillographic recorders for following rapid changes in signal. A high speed scanning attachment is among the auxiliaries provided for use with the horizontal spectroscope illustrated in Fig. 13. A mirror rotatable about an axis perpendicular to the direction of dispersion, and parallel to the spectrum lines, is placed in the light path just before the focal surface at P, Fig.

More recently, polarizing interference monochromators have been employed to fulfill similar functions, either with auxiliary guiding telescopes (Fig. 13, 1\ and F2 ) as in the solar tower telescope of the Crimean Astrophysical Observatory, or with light reflected from polished slit jaws (Fig. 21) as in the McGregor Tower Telescope of the McMath-Hulbert Observatory 3. In both cases, a photograph taken through the filter is a detailed record of the position of the spectroscope slit in relation to the solar detail.

7 Concave mirrors Lloyd H. 3 Collimator mirror Camera mirror Lloyd H. 0 ---- Camera mirror Collimator mirror Camera mirror Camera mirror Optical Institute Leningrad Optical Institute Leningrad Sect. 18. 39 Some instrumental problems of solar observation. scopes and accessories. numbered as in GOLLNOW'S table which includes nos 1 -14 only_ -Some of the major solar observatories do not use tower telescopes. ~Iany of these are listed in Table 1, by R. COUTREZ in: The Solar System, Vol. 1: The Sun, ed.

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