XCVII. A rotating-lobe interferometer and its application to radio astronomy

An interferometer, operating on the rotating-lobe principle, is described. It is shown how the frequency of the interference patterns observed from discrete radio sources may be controlled and made independent of the baseline length and direction. The application of the instrument to observations with a short north-south baseline and a long (630 λ) baseline is illustrated by experimental results. It is pointed out that the use of this technique is of particular value for the observation of weak sources with long baselines.