Abstract: In a gyro apparatus comprising a binnacle, a gyro the spin axis of which is made substantially horizontal, a supporting apparatus for supporting the gyro from the binnacle with a freedom of three axes, a north-seeking apparatus for giving a north-seeking action to the gyro, a follow-up ring following up the gyro around its vertical axis, a servo motor for rotating the follow-up ring by a deviation singal around the vertical axis of teh gyro relative to the follow-up ring and a transmiting apparatus for transmitting an azimuth angle of the spin axis relative to the binnacle to the outside, the gyro apparatus is characterized in that the transmitting apparatus is formed of a digital encoder having a reference angular position transmitting device and a first counter apparatus being made operable by an output signal of the encoder.

Abstract: A magnetic sensor including an annular iron core, an annular hollow bobbin for a primary winding which incorporates therein the annular iron core, the bobbin having a plurality of protruded portions which are arranged along a circumference of the annular bobbin with an equal distance, each of the protruded portions being extended in a direction parallel to a center axis of the annular iron core, the primary winding being wound on the annular bobbin at respective portions between adjacent protruded portions with an equal number of turns, a bobbin for a secondary winding having a positioning means for the primary winding in association with the protruded portions of the bobbin for the primary winding when the bobbins for the primary and secondary windings are assembled, the secondary winding being wound on the bobbin to form more than two pairs of winding groups.

Abstract: A gyro apparatus comprising a gyro casing incorporating therein a gyro the spin axis of which is made substantially horizontal, a supporting apparatus for supporting the gyro casing with a freedom of three axes, a north-seeking apparatus for giving a north-seeking action to the gyro, a follow-up ring having a follow-up shaft which follows the gyro casing around its substantially vertical axis, a binnacle for supporting the follow-up shaft, a servo motor for rotating the follow-up shaft and a slip ring for supplying a power to the gyro and the like through the follow-up shaft, in which the follow-up ring is formed as a fork-shape and supported to the binnacle in a canti-lever fashion, the follow-up shaft is rotatably supported to the binnacle by one thin-type ball bearing having a large diameter and one bearing having a small diameter, the follow-up shaft is fixedly provided with a rotor of a pancake-type servo motor of a direct drive system, a stator of the servo motor is attached to the binnacle at the posit

Abstract: A vibration-type gyro apparatus is disclosed, which includes a vibration mass portion, a piezo-electric element for detecting the displacement of the apparatus and a preamplifier having an input resistance R and supplied with the output from the piezo-electric element, wherein the input resistance R is selected to have a value substantially expressed as R.apprxeq.1/C.omega. (where C is an electrostatic capacity of the piezo-electric element and .omega. is a vibration angular velocity of the mass portion) so that the gyro apparatus will be substantially free of variations due to temperature changes.

Abstract: An erector for holding a spin axis of a gyro rotor in the vertical direction used in a gyroscopic horizon or gyro vertical which comprises a gyro casing incorporating therein a gyro rotor rotating at high speed, a spin axis of the gyro rotor being held substantially in the vertical direction, first supporting member for rotatably supporting the gryo casing around a first horizontal axis which is perpendicular to the spin axis and second supporting member for rotatably supporting the first supporting member around a second horizontal axis which is perpendicular to both the spin axis and the first horizontal axis is disclosed, which includes a base plate, a motor mounted on the base plate, a rotation receptacle container having an annular shape cavity and rotated at low speed by the motor, and liquid charged into the annular shape cavity of the rotation receptacle container, the base plate being mounted on the gyro casing such that the rotation axis of the rotation receptacle container and the spin axis of the

Abstract: A gyro apparatus is disclosed which includes a base table, a detecting piezoelectric element attached at its one end to the base table such that its longitudinal direction, is perpendicular to the surface of the base table, a tuning fork having a vibration surface parallel to the surface of the base table and disposed such that its axis is parallel to the surface of the detecting piezoelectric element, and an L-shaped attaching portion attached to a base portion of the tuning fork such that its one leg portion is parallel to said surface of the base table and extended in the direction to vibration mass portions of the tuning fork, wherein the one leg portion is attached with the other end of the detecting piezoelectric element.

Abstract: An accelerometer is disclosed, which includes a flexible hinge, a base table fixed with one end of the flexible hinge, a pendulum fixed to the other end of said flexible hinge, torquers for producing a torque proportional to acceleration applied from the base table to the pendulum and a displacement detecting apparatus for electrically detecting a relative displacement between the fixed portion of the base table and the pendulum, wherein the base table is formed of first and second frames, the first frame is provided with an engagement portion for engaging with the second frame, a fixed portion for the flexible hinge, a fixed portion for the displacement detecting apparatus. In this case, the first frame is provided at its outer peripheral portion with an attaching flange portion and, one plane of the flange portion is used as an attaching reference plane for attaching the accelerometer to a body the acceleration of which is to be measured.

Abstract: An ultrasonic flaw detector having a probe for transmitting and receiving an ultrasonic wave, a receiver for producing an electric signal in response to the ultrasonic signal from the probe, a plurality of gates and a counter having a corresponding number of independent display elements for indication of detected results. In this case, the detected result can be indicated without using a cathode ray tube.

Abstract: An ultrasonic flow or current meter having at least one pair of transducers, a transceiver which applies a pulse signal to one of the transducers to produce an ultrasonic pulse wave, the other transducer receiving the ultrasonic pulse wave and producing the corresponding electrical signal, a reference pulse signal generator, a counter for counting the pulse signals from the reference signal generator in relation to the corresponding electrical signal, and a logical operational circuit. The logical operational circuit is supplied with the output signal from the counter and calculates a difference between a first reciprocal of a time required for the ultrasonic pulse wave to propagate from one of the pair of transducers to the other transducer and a second reciprocal of a time required for the ultrasonic pulse wave to propagate in the reverse direction between the pair of transducers, with the difference between the first and second reciprocals being multiplied by a constant.

Abstract: A marine radar transmission and reception system in which first and second transmission pulse radar waves are emitted as first and second pulse radar waves from first and second radar antennae or a common radar antenna; reflected waves of the first and second emitted pulse radar waves are received as first and second received pulse radar waves by the first and second radar antennae or the common radar antenna; the modes of the first and second transmission pulse radar waves are selected in cooperation with those of the first and second radar antennae or that of the common radar antenna so that the first and second received pulse radar waves may be received by the first and second radar antennae or the common radar antenna independently of each other; a quotient or difference output corresponding to the quotient or difference of the first and second received pulse radar waves or the first and second received outputs based thereon is obtained; and sea clutter eliminated received pulse radar waves or outputs bas

Abstract: An ultrasonic flow or current meter is disclosed in which a first ultrasonic sing-around system is connected to a pair of ultrasonic vibrators attached to a pipe through which liquid to be measured flows, a second ultrasonic sing-around system is also connected to the pair of ultrasonic vibrators, and the second ultrasonic sing-around system transmits an ultrasonic pulse in the direction opposite to that of the first ultrasonic sing-around system. In this case, the phases of the ultrasonic pulses from the first and second systems are detected, and the amount of delay of the pulse in one of the systems is controlled by the output signal to be always constant, whereby the velocity of the liquid flowing through the pipe is measured.

Abstract: A pulse reflection type ultrasonic thickness meter having an ultrasonic transducer which supplies an ultrasonic pulse wave to an object to be measured and receives an echo pulse from the object and a counter which counts the time difference between the transmission of the ultrasonic pulse wave and the echo pulse. In this case, a switching circuit is provided which controls the counter in such a manner that a power source is disconnected from the counter during a non-measurement time period.