Abstract: A capacitance transducer has a first hermetically sealed cavity adapted to deform in response to an applied force, such as pressure or acceleration, and a second hermetically sealed cavity adapted to resist deformation in response to such applied force. The cavities are formed between two doped silicon layers separated by a selectively etched electrically insulating spacer layer. Multiple medial electrically insulating cavity area spacer segments within the second cavity resist deformation thereof in response to the applied force to be measured. The capacitance transducer can be manufactured from doped silicon wafers using well developed silicon wafer processing techniques.

Abstract: A steel member, essentially rectangular in cross-section, obtained by mechanically working round steel stock, having an aspect ratio greater than 2, wherein the member is characterized by a tensile strength greater than 200 KSI, a fatigue endurance limit greater than 100 KSI and a heat treated microstructure of tempered martensite, bainite or mixtures thereof.A method is disclosed for making a steel member comprising the steps of providing steel stock with a round cross-section having a pearlitic microstructure and at least 0.35 percent carbon, forming an essentially rectangular member having an aspect ratio of at least 2 and heat treating the member so as to provide a microstructure of tempered martensite, bainite or mixtures thereof.