Abstract: A multi-section, square tube guide bar assembly, incorporates an intermediate adapter which is resiliently engaged with guide bar sections, to form a firm, tight, aligned and rugged guide bar assembly. The intermediate adapter has a plurality of splayed leaf springs in which the spring ends are tapered and inwardly inclined to facilitate the adapter engagement with the guide bar sections.

Abstract: There is disclosed an apparatus and a technique for shunt calibration of a Wheatstone bridge array independent of temperature. The structure involves a side completion half bridge array which has two temperature sensitive resistors as semiconductor strain gages forming one arm of the bridge and two temperature insensitive resistors forming the other arm of the bridge. An input voltage is applied to two opposite terminals of the bridge via equal span resistors and an output is taken between the common terminals of each of the bridge arms. A calibration resistor is positioned to shunt a span resistor and a temperature insensitive resistor to provide a calibrated output voltage of a magnitude independent of temperature.