Abstract: A toilet bowl illuminating apparatus of the type wherein a seat ring is pivotally mounted to a toilet bowl by a pair of spaced apart, co-axial hinge assemblies, has a light assembly, which is activated by a switch responsive to angular orientation, affixed in a cavity at the seat ring rear edge proximate the hinge axis, where the length of the light assembly body is resiliently reduced, so as to be gripped by spring forces, with the light being held to illuminate the toilet bowl interior when the seat ring is raised and deactivated when the seat ring is lowered.

Abstract: A drilling fluid system for use in oil and gas well drilling operations is described having a rheological modifier/control agent comprising a polyalkyl methacrylate copolymer containing a small amount of vinyl pyrrolidone, a weighting agent, optionally an organophilic clay, with a base fluid making up the balance. The drilling fluid may be oil, invert emulsion, and in particular synthetic base fluid where the continuous phase may be synthetic esters olefins, paraffins, mineral oil or diesel oil, and the like. These copolymers prevent or reduce barite sag and provide cutting transport in these drilling systems.

Abstract: A lamp assembly having a gravity actuated switch and battery power is provided for attachment to a toilet seat ring at the rearward portion thereof, proximate the pivotal axis of attachment of the seat ring, so as to be rotated from a position remote from the toilet bowl interior when the seat ring is in the "down" position with the lamp inactive and directed at the toilet bowl interior when the seat ring is in the "up" position and the light is consequently operative.

Abstract: An optical device for panoramic viewing comprising a housing provided with an entry window, a plurality of spaced receptive areas and a lens system for each receptive area so disposed that it lies between the entry window and the associated receptive area, the lenses within each said system being arranged so that an image of a respective sector of a panoramic scene is formed at each receptive area.