Abstract: A process for forming durable, mechanically strong compacts from feed mixtures comprising solid particles in contact with a liquid (e.g., carboniferous particles in contact with water) which does not require use of a binder is disclosed. The process comprises applying a compressive stress to the feed mixture either by compacting the feed in a mold or by extruding the feed through the die of a suitable extrusion apparatus while controlling certain process parameters, including the moisture content and the zeta potential of the particulate feed. The process can be used to form large, cylindrically-shaped compacts from coal particles (i.e., "coal logs") so that the coal can be transported in a hydraulic coal log pipeline or by conventional means.

Abstract: A windmill is provided which automatically compensates for increased wind velocity, causing the blades to feather and rotate at a substantially constant velocity rather than overspeeding. This is accomplished by pivotally mounting the blades so that they are rotatable between positions of relatively high angle with respect to the direction of the wind and positions of relatively shallow angle, with a resilient means biasing them to the former position. Tabs projecting forwardly at obtuse angles from the outer ends of the leading edges of the blades cause the blades to be pivoted to the feathered position when wind velocity increases.