Abstract: Seal oil contaminated with H.sub.2 S has air or N.sub.2 bubbled therethrough for reducing the H.sub.2 S content of the liquid. The bubbling of the gas through the contaminated liquid is achieved by way of a novel two-state sparger unit situated in a container which receives the contaminated liquid, this container being vented at an upper portion to the outer atmosphere and being connected with a pipe which withdraws decontaminated liquid from the container.

Abstract: A piston and cylinder machine for use as a prime mover, pump or compressor in which there are at least two pairs of pistons and cylinders for each crankpin, the cylinders of each pair being disposed on opposite sides of the crankpin and rigidly connected to each other by a yoke. For each cylinder pair, there is rotatably and eccentrically mounted on the crankpin a disc rotatably received in a respective yoke and whose eccentricity relative to the crankpin is equal to that of the crankpin relative to the crankshaft whereby the piston stroke is twice the crankpin throw. The discs are integral with each other within their superimposed peripheries so that a short, stiff crankpin may be used, and they are out of phase by twice the angular separation of the pairs of cylinders.