18,763. Wade, H., [Kreutzberg, O. A.]. Aug. 17. Fixed-abutment type, with piston 19 having hinged vanes 22. The part 27 of the casing wall 6 is curved, preferably involute, so that a leading vane approaching the outlet 18 exerts suction on the vane just passing the inlet 11 in order to keep it against the wall, and the space between two vanes contacting with the wall does not decrease. The part 28 of the wall is less eccentric than the part 27. The vanes are held up to the casing by coiled springs 25 arranged in the pivot sockets 24. A strainer 15 is arranged in the inlet.
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