Abstract: A pressure transducer comprising an elongate hollow outer housing having a pressure sensor diaphragm and externally positioned fixing means which facilitates pressure tight introduction of the diaphragm into a pressure sensing port provided in apparatus capable of generating pressures to be sensed, two elongate members positioned within the outer housing in operative association with the diaphragm so as to move differentially in a direction parallel with the longitudinal axis of the housing consequent upon movement of the diaphragm responsively to a pressure to be sensed, and transducer means responsive to differential movement between the elongate members for producing a signal in dependence upon the pressure sensed.

Abstract: A process for preparing a surface for adhesive bonding to a second surface having the steps of abrasion cleaning the surface and then applying an adhesive thereon, wherein the improvement over prior art processes comprises the displacement of atmospheric gases from the surface by means of a dry inert gas. The abrasion cleaning is preferably achieved by bombarding the surface with particulate matter and removing the particulate matter before application of adhesive to the surface. The process is suitable for preparing metal surfaces for metal to metal bonds.