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paper presents a detailed study of the accelerated beams dynamics, prior to extraction, for the K-500 cyclotron under construction at M.S.U. The results, for a number of representative beam, indicate that adequate turn to turn separation can be achieved, while keeping distortions to a substantially negligible level. The presence of the νR + 2νZ = 3 resonance, and its effect in limiting the cyclotron dynamic range is also discussed.
A review of a half-century of photographic work on the measurement of stellar distances. The evolution of the observing programmes is discussed, the methods currently used are described, and the limitations on the accuracy attainable are specified. It is urged that the work should continue so as to minimize the effect of observational selection and to strengthen the calibration of parallaxes obtained by other than trigonometrical methods.
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