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By Donald E. Billings

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A sufficient number of units are placed in the filter to separate the bands to the extent that one of them may be isolated by an ordinary glass filter. A biréfringent filter requires very precise workmanship in making each piece of crystal exactly the correct thickness. Furthermore, its temperature must be maintained to a fraction of a degree, and the filter must therefore be surrounded by a well-constructed thermostatically controlled heating unit. Finally, it will not operate properly in light that departs C.

1-cm radio corona, from the 3 ' pencil beam of the Mills Cross of the Stanford Radioscience Laboratory. Courtesy, Stanford Radio Astronomy Institute. 6-41 Mc/sec) (Boischot et al, 1960) (Fig. 14). Frequency is typically varied in these instruments by a motor-driven variable condenser in the intermediate-frequency oscillator. Antennas vary with the wavelength range being studied. The Australian system uses a rhombic antenna; the Fort Davis uses three different types of antennas for three frequency ranges, all fed by a 28-ft parabaloid reflector; and the Boulder system consists of dipoles in corner reflectors, the two antennas being arranged as a steerable interferometer.

136, 956. Athay, R. , and Roberts, W. O. (1955). Coronal line intensities at the Khartoum Eclipse. Ap. J. 121, 231. Blackwell, D . E . (1955). A study of the outer corona from a high-altitude aircraft at the eclipse of 1954 June 30. M. A. S. 115, 629. Blake, R. , Chubb, T . , and Unzicker, A. E. (1963). Interpretation of X-ray photograph of the sun. Ap. J. 137, 3. , Lee, R. , and Warwick, J. W. (1960). Low frequency solar bursts and noise storms. Ap. J. 131, 61. Boyd, R. L. F . (1962). A program for astronomical studies by rocket-borne instruments, in l'Space Age Astronomy" (A.

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