Abstract: A cleaning assembly for cleaning electrically conductive, flexible contact springs around the perimeter of a closure in a shield erected to prevent the passage of unwanted electromagnetic radiation. A pressurized solvent supply system and a vacuum recovery system are mounted in portable cabinet and each is connected via a flexible hose to a hand held cleaning head. The cleaning head comprises a trigger operated spray gun having a support block with a narrow vacuum recovery slot located immediately adjacent to and extending downwardly from the nozzle of the spray gun. The vacuum recovery slot is connected via an internal cavity in the support block to the hose leading to a vacuum recovery container.

Abstract: An improved fracturing fluid for use in hydraulic fracturing of subterranean formations and comprising an aqueous fluid containing an effective amount of a guar containing gelling agent, an effective amount of a crosslinking agent to crosslink the gelling agent and a retarding agent for delaying the crosslinking reaction. The crosslinking agent is a rare earth metal containing compound, such as a ceric salt. The retarding agent for the ceric salt comprises a first mixture consisting essentially of about 1 part of a carboxylic acid and from about 1 to 1000 parts of the alkali metal salt of the carboxylic acid. The retarding agent further comprises a second mixture consisting essentially of about 1 part of a hydroxycarboxylic acid and from about 1 to 1000 parts of its alkali metal salt or about 1 part of an aminocarboxylic acid to from about 1 to 1000 parts of its alkali metal salt.

Abstract: An aerodynamically enhanced air grill mounted on a vehicle is provided which comprises an air intake grill and a pair of air discharge grills. The air intake grill, and each of the air discharge grills, are provided with an array of substantially vertically, spatially disposed air foils for directing air flow therethrough. Each of the air foils constituting the array of air foils is provided with a cross sectional configuration substantially corresponding to an air foil section. An interior, substantially V-shaped, deflector barrier can be disposed directly behind the air intake grill so as to extend rearwardly with opposite ends of the deflector barrier attached to the grill frame rearwardly of the air discharge grills.

Abstract: A process for the thermal destruction of waste materials of unknown volatility disposed within a container, the process comprising the steps of (a) placing the open container in a combustion chamber of a pyrolysis furnace; (b) providing the pyrolysis furnace with a reducing atmosphere and raising the temperature in the pyrolysis furnace to remove volatile components of the material until a preselected temperature is reached; (c) maintaining the temperature in the pyrolysis furnace while controllably adding air until all the combustible materials are pyrolyzed; (d) continuing to add air during a final oxidation period to achieve combustion of all nonvolatile combustible materials; and (e) processing all volatilized materials in a secondary combustor fluidly communicating with the pyrolysis furnace.

Abstract: An exerciser with an electrical stimulating device for exercising persons having paralyzed legs and the like, the exerciser having bicycle-like pedals supported on rotatable arms, and having a switchboard disposed in a plane substantially parallel to the rotational plane of the rotatable arms. Arrays of magnetically actuated switches are supported by the switchboard in semi-circular paths, and a permanent magnet is supported by one of the rotatably arms to sequentially activate the switches which, as part of a circuit containing a neuromuscular stimulator, effects selective electrical stimulation of the persons muscles to effect rotation of the rotatable arms.

Abstract: An acrylic resin is provided which has excellent weatherability, outstanding transparency and improved heat and solvent resistance, as well as improved impact strength. The acrylic resin comprises an intimate blend of a polymerization syrup and a catalytic amount of a polymerization catalyst capable of effecting polymerization of the syrup. The polymerization syrup, which has an improved shelf life and can be stored at ambient temperature and atmospheric pressure, consists essentially of:(a) from about 300 to about 1000 parts per volume of an acrylic monomer represented by the formula ##STR1## wherein R is an alkyl moiety containing 1 to about 18 carbon atoms; (b) from about 0.1 to about 1 parts by volume of 2,2-bis(allyl-oxymethyl)-butan-1-ol;(c) from about 0.5 to about 5 parts by volume of a mercaptan; and(d) from about 0.3 to about 40 parts by volume of a crosslinking agent compatible with the acrylic monomer.

Abstract: A boat lift for raising and lowering a boat in a boat slip disposed between spaced apart parallel dock sides, the lift having a pair of cross members disposed perpendicularly to the dock sides and supporting a boat support frame. The cross members are slidably connected to parallel guide arms angularly attachable to the dock sides via adjustable dock clamps. One or more tanks are attached to the cross members for supporting same at selected heights in a body of water, and pressure hoses and valves are provided for selectively admitting compressed air or water into the tanks for raising and lowering the boat support frame relative to the water.

Abstract: A truck-bed holder for fastening and securing an article in a pickup truck, the truck-bed holder comprising a length-wise adjustable post with a foot member at one end thereof and a plate at its other end, the adjustable post extendible and vertically adjustable so that the plate tightly abuts the underside of the wall flange of pickup. A fastening assembly is supported by the adjustable post and secures an article thereto.

Abstract: An improved characterizing linkage assembly of the type utilized to proportion the flow of fluids in response to motor controls, such as in the control of fuel and air mixtures in industrial combustion systems. The linkage system comprises a cam assembly having an adjustable curvilinear cam band, which is rotatable by a drive shaft. A biased follower rod, bearingly supported for reciprocal movement, is urged against the cam band. Movement of the follower rod pivots a linkage actuator arm which is bearingly supported on the drive shaft. Rotation of the drive shaft in response to a change in a selected process parameter imparts movement to the cam band, the follower rod and thus the linkage actuator arm being the proportional travel.

Abstract: A magnetic disk substrate polishing assembly used for polishing a surface of a disk substrate as the disk substrate is rotated, the polishing assembly comprising a polish roller having a polish cloth or polish tape continuously fed thereon. The polish roller is rotatably mounted on an assembly housing with the polish roller disposed adjacent the rotating disk blank. The polish roller is moved toward and pressed against the surface of the disk substrate with the polish tape therebetween. The polish roller is spring biased in a direction toward and perpendicular to the surface of the disk substrate which allows the roller with polish tape thereon to conform to the surface of the disk substrate so as to reduce ripples and make a uniform pattern on the polished surface of the disk substrate when the polishing operation is completed.

Abstract: A calibration container for accurately measuring a desired quantity of a selected liquid, the calibration container comprising an open-top vessel made of a substantially transparent material and having a neck portion extending vertically from a body portion thereof. Scale support ribs extend along opposite sides of the neck portion to slidably support a graduated indicator scale which has a zero indicator mark, the indicator scale attachable to the neck portion in a permanent location determined after aligning the zero indicator with a liquid meniscus formed in the neck portion and viewable through the neck portion.