Abstract: A frequency deviation meter provides a display of the error in a timepiece's internal oscillator, and includes a plurality of pickup devices among which are electrostatic and ultrasonic detectors. Frequency of the timepiece's oscillator and the frequency error is displayed as seconds lost or gained per month. An elongated aluminum alloy resonant column of tool stock material having a crystal pickup provides a sensitive vibration detector assembly.

Abstract: A displacement transducer capable of accurately measuring small displacements. The transducer includes a magnetostrictive wire exposed to a stationary magnetic field and having an S-shape, one arc forming one section of the wire and the reverse arc the adjacent section. One end of the wire is fixed, whereas the other end is attached to a displaceable element whereby movement of the element changes the radius of curvature of the arcs. An amplifier whose input is connected to one section of the wire and whose output is connected to the other section thereof yields electrical pulses in the output to produce torsional vibration of the two sections, creating a sinusoidal electrical signal which is fed back to the amplifier input, thereby sustaining oscillations therein whose frequency depends on the radius of curvature and is therefore a function of the extent of displacement. Means are provided to linearize the relationship between displacement and frequency.