Abstract: The invention concerns a method of manufacturing a measuring device of the Fabry-P erot resonator type. The invention likewise concerns a measuring device manufactured by means of the method. The measuring device is particularly intended for measurement of the pressures inside engine cylinders and comprises a cavity and a first part and a second part, said two parts sandwiching the cavity between them. At least the first part, which consists of silicon, supports a spacer layer of silicon dioxide formed through thermal oxidation. The spacer layer which is partially removed through etching, is joined to the second part using the technique known as direct bonding (SDB).

Abstract: A method for the measurement of accelerations and an apparatus for performing the method, whereby ions in a solid ion conductor are exposed to the acceleration for generating a measurable voltage. The ion conductor is arranged so that the accelerations are applied along a longitudinal axis thereof. A support structure is arranged around the ion conductor to provide mechanical support therefor. When the acceleration is applied to the ion conductor, the movement of the ions therein generate a voltage across the length of the ion conductor which voltage is supplied, via electrodes at opposing ends of the ion conductor, to a voltage measurement and evaluation device.

Abstract: A process for the remote transmission and indication of measured values of a plurality of electrolysis cells, comprising sequentially interrogating the measured values in the electrolysis cells by means of an electronic pulse counter and an electronic check-point reversing switch connected to the pulse counter, transmitting the measured values in the form of an analogue signal to a separate monitoring facility common to said cells, and controlling the electronic pulse counter at the electrolysis cell from the monitoring facility by switching pulses or a pulse series, a maximum of four signal wires being provided between each electrolysis cell and the monitoring facility irrespective of the number and type of check points.