Abstract: A garment or apparatus worn by emergency workers includes an electrically operated source of multiple, mutually diverging laser light beams. The light beams may be modulated to identify the worker and his status. The worker's location in an emergency environment is readily established as the locus of the diverging beams. A smoke-filled environment makes the laser beams more visible to rescuers.

Abstract: A portable illuminator for use in an atmosphere of fog, haze or particulate matter includes a laser for generating a light beam, and a light-beam scanner for scanning the laser beam over a line or area to be illuminated. The scanning may be accomplished by mechanically moving the mirror or the laser, or a moving lens may be used. In another embodiment, a microelectronic scanning reflector is used.

Abstract: A rotary-driven valve is coupled to a rotary actuator. The coupling includes a shaft having longitudinally extending drive pins offset from the shaft axis. The drive pins contact drive surfaces of drive plates which have a valve stem opening which mates with the valve stem. The drive plates can slide relative to the valve stem with one degree of freedom, and the drive pins can slide relative to the drive plates with a second degree of freedom. Sliding movement of the first drive plate and/or the second drive plate allow the shaft axis to be angled and/or laterally displaced relative to the valve stem axis. The drive plates provide a dynamic adjustment freedom so bending moments and radial forces are not imposed on the valve stem. The drive plates may also provide thermal insulation between the valve stem and the actuator.

Abstract: A protective cover for sewer clean-out lines for protection of the termination end of the sewer clean-out line, but permitting access to the sewer clean-out line, the housing having a cast iron collar with removable cover made into an ABS plastic skirt by force fitting, the plastic skirt having a flared lower end to maintain the position of the housing with the upper surface and cover of the cast iron collar being flush with the level of the ground.

Abstract: A device for threading an eyelet, e.g., a fish hook or needle, has a resiliently deformable loop attached to a pen light such that the loop and the eyelet are in the path of the light beam to illuminate the process of inserting the loop, catching the line to be threaded and pulling it through the eyelet. The lens of the pen light is solid and the end or base of the loop means is embedded in the lens material.

Abstract: A method for transferring heat away from an ultrasonic medical transducer having a face wherein heat is generated. The method is accomplished by positioning a heat sink behind the transducer face, securing the heat sink to a braided power cable, applying a heat conductive epoxy to the heat sink, and assembling a plastic housing around the heat sink. The transducer face is cooled by conductive heat transfer by transferring the heat into the heat sink, then transferring the heat into the epoxy, then transferring the heat into the power cable and the plastic housing before finally dissipating into the surrounding air.

Abstract: A combination pH and CO.sub.2 sensor employs separate sensors. Each sensor has a wire with an electrochemically active layer, an electrolyte layer and a membrane between the electrolyte layer and the fluid to be tested. Each electrolyte layer is constructed of a dried residue which can be easily stored and which must be rehydrated prior to the first use. The electrolyte layer in the pH sensor when hydrated forms an aqueous solution buffered against changes in pH due to changes in the dissolved CO.sub.2 concentration and is preferably formed of 2-(n-morpholino) ethanesulfonic acid, 2-(n-morpholino) ethanesulfonic acid - sodium salt and potassium chloride. The electrolyte layer in the CO.sub.2 sensor when hydrated forms an aqueous solution having bicarbonate ions and is preferably formed of polyvinyl alcohol, sodium chloride and sodium bicarbonate. The electrical potential at the pH sensor is proportional to the pH of the fluid. The electrical potential difference between the CO.sub.

Abstract: A method for determining the success of a multiple perforation operation by determining whether all perforations are open comprising providing a fluid loss control composition which carries one or more materials designed to form a filter cake on the wellbore wall, at least one of the filter cake forming materials being radioactively tagged, injecting the fluid loss control composition into the wellbore and into the perforations to build up a filter cake on the wellbore wall behind the perforations and running a nuclear log survey in the wellbore to determine which of the perforations were sufficiently open to the wellbore wall to establish a filter cake buildup thereon.

Abstract: A method for determining the vertical extent of a fracture in a wellbore wall wherein a fluid loss control composition is employed which contains at least at one filter cake forming material which has been radioactively tagged so that upon injection of the fluid control composition into the wellbore in the vicinity of the fracture, the filter cake is built up along the fracture and thereafter, upon running a nuclear log survey in the wellbore to determine the vertical extent of the filter cake, the vertical extent of the fracture is also thereby determined.