Abstract: A device is provided for detecting the presence of solid impurities within a pressurized fluid. The device comprises a housing having a fluid passageway formed therein. One end of the fluid passageway is open to the pressurized fluid while the other end of the fluid passageway is open to a low pressure fluid region via a restricted port. A filter strip dispensed from a filter strip magazine is disposed across and obstructs the fluid flow through the passageway at a point intermediate its ends so that the filter strip removes solid or liquid particles from fluid flowing through the passageway. A differential pressure sensing means, such as a differential pressure transducer, communicates with the fluid passageway and detects the differential pressure across the filter strip. An increase of fluid pressure sensed by the differential pressure sensing means is indicative of a clogged filter strip which, in turn, indicates the presence of solid impurities within the pressurized fluid.

Abstract: In an internal combustion engine having a cylinder, a working piston reciprocally located therein and a cylinder head cooperating to define a combustion chamber, the incorporation therein of a precombustion chamber formed in the space of the main combustion chamber and further dividing the main combustion chamber into secondary combustion chambers. Apertures in the precombustion chamber provide for communication between the precombustion chamber and the secondary combustion chambers to promote flame front propagation therebetween. The intake and exhaust ports as well as ignition means are located in the precombustion chamber.