Abstract: An end fitting for a sucker rod for oil wells is described with the end fitting having a chamber portion extending inwardly from one end thereof and an externally threaded portion at its other end. The chamber portion is defined by a plurality of spaced-apart annular ridges which define frusto-conical shaped cavities therebetween. The end fitting also has a bore extending inwardly thereinto from its other end which communicates with the inner end of the chamber portion. A valve is mounted in the end fitting and has a valve stem positioned in the bore and a valve head positioned at the inner end of the chamber portion. The chamber portion is adapted to receive a glass reinforced resin bonded cylindrical rod which is maintained therein by a two-part epoxy resin which surrounds the rod and is received in the cavities to form epoxy wedges bonded to the rod.

Abstract: An oil well sucker rod shear tool is described comprising a generally cylindrical elongated member having externally threaded portions at the opposite ends thereof. The elongated member has a reduced diameter portion formed therein between the ends thereof which serves as a shear portion designed to shear upon a predetermined amount of stress being subjected thereto. A cylindrical sleeve is sealably mounted on the elongated member around the shear portion not only to protect the shear portion from the corrosive effects of the fluid being pumped but to also prevent deflection of the shear portion. A cylindrical nut is threadably mounted on the elongated member to maintain the sleeve thereon.

Abstract: Analysis apparatus with flexible multi-analysis capability, suitable for example for biochemical constituent analysis, has a single channel of reaction vessels arranged to receive reagents from any of a battery of reagent reservoirs and has photometer elements from measuring the reaction in each reaction vessel on a repetitive sequential basis. Control elements select the sample liquid delivered to each reaction vessel, select the reagents added thereto, and select the data processing for the photometer or other measurement information secured for reactants in that reaction vessel. The photometer elements apply and detect optical energy along selected directions to provide any of several photometric measurements, including for example of colorimetry, fluorometry, or nephelometry.