Abstract: A panel for controlling light passage, suitable for use as a windscreen, a window pane, or as a windscreen portion of vertical, south facing solar collection devices. The panel includes finned portions arranged to receive light falling upon the windscreen in amounts dependent upon the angle of incidence of the light onto the windscreen. The fins form portions of prisms or refractive elements which serve to refract the light in a direction tending to inhibit the passage of the light through the windscreen. In one embodiment, the finned portions are attached extending inwardly from a smooth planar surface. In two other embodiments the finned portions interconnect planar surfaces to form a saw-tooth or "Z" configuration, and constitute a structure which can be easily fabricated.

Abstract: Apparatus for use in exercising and toning muscles principally used in skiing includes a base having a supporting bottom with sides upwardly extending from a central apex about which the base is rockable between semi-stable positions. A pair of foot pedals rest atop the base within grooves parallel to each other and to the apex of the base of the block. The foot pedals are of generally triangular cross sectional shape to be rockable between semi-stable positions on the block. The foot pedals additionally are moveable forward and aft to simulate the foot positions of actual skiing.

Abstract: Liquid sampling apparatus including a sampling head incorporating a floating pressure seal effected by a positive pressure introduced into an open top sample container in which the sampling head is telescopically introduced. The liquid sampling apparatus includes a compartment having at least an entrance, a cover slidable within said compartment and the sliding cover carrying the sampling head. The sliding cover has a depending shield capable of closing off the entrance to the compartment when the assembly head is therein introduced.The floating pressure seal is defined by a mounting ring seated in a suitable passageway formed in the cover. The mounting ring has a central aperture and a plunger is slidable within said aperture, one end of the plunger being threaded and having an adjusting ring threadably engaged thereupon for limiting the extent of free movement of the plunger relative to the mounting ring. The other end of the plunger has an enlarged head or piston.