The absolute calibration of solar radio flux density in the microwave region, which showed considerable discrepancies until 1966, has become completely uniform through international cooperative work. A complete history is described to avoid confusion, and correction factors are derived to convert the published values into absolute values for long series of routine observations. It is also shown that the most reliable calibration cart be made by using a large pyramidal horn and by using sky and room temperature as calibration standards.

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The 150-foot slotted waveguide antenna for operation on a wavelength of 10 centimeters at the National Research Council, Ottawa, Canada, is now in operation as one element of an interferometer. The other element is itself a simple interferometer with element separation equal to that of the long array and is placed to the west on the common E-W axis. A rotary phase shifter in the arm between the array and simple interferometer is used, after Ryle, with a phase-sensitive detector. The resultant pattern consists of the product of three terms: I) The single-lobe pattern of the long array; 2) the interference pattern of the simple interferometer, and 3) the interference pattern between the simple interferometer and array.This configuration gives a twofold increase in E-W resolving power over a uniformly collecting aperture of equal dimension. The presence of two interference patterns suggests the name, "compound interferometer," and the new antenna produces a fan-shaped beam 2' E-WX2" N-S. The instrument has been used to obtain daily drift curves of the sun.