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Stabilized flow in capillary-type closed viscometer.

Small periodic variations in a main gas flow through a capillary are reduced from 1% to 0.1% in peak-to-peak width by a feedback circuit between a pressure gauge and a motor of a pump. The variations in flow result from nonlinear transmission of a worm mechanism in a capillary-type closed viscometer, Dynamical properties of the system are discussed by the Laplace transform method, and it has been shown that low pressure, a long guide tube, and high gain of the amplifier are responsible for the flow instability.