Abstract: The unoccupied space intermediate the races, the rolling bodies and the metal cage of a conventional antifriction bearing is filled with a solidified antifriction compound, with the cage of the conventional bearing being fast with the compound and reinforcing it. An annular gap is provided intermediate the outer race of the bearing and the solidified compound body for removal of the wear products. To manufacture a bearing of this kind, a bearing of the conventional kind is filled with a solidifiable antifriction material, with subsequent thermal treatment. The invention offers a simple, readily implementable and relatively inexpensive technique of adding a new quality to conventional antifriction bearings, viz. the ability of prolonged operation under adverse conditions, without periodic lubrication.

Abstract: A method of measuring properties of a fluid in a container, wherein acoustic oscillation pulses are periodically applied to said fluid through the container wall and normally thereto, is disclosed. The acoustic signals are received in the zone of application of the acoustic oscillation pulses as envelopes of the pulse acoustic reverberation produced between the outer surface of the container wall and the fluid, said envelopes being used to form an electrical signal carrying information on the properties of the fluid. A device for measuring properties of a fluid in a container comprises an acoustic transducer positioned directly on the outer surface of the container wall and a series-connected circuit, composed of an electric pulse time delay unit, a gating pulse generator and a gating acoustic signal amplifier, coupled to the acoustic transducer.