Abstract: A total air temperature (TAT) probe having a self-regulating heating system is provided. A TAT probe housing includes at least one heating cavity that is located proximate to a tip of the TAT probe. A heating element is received within the at least one heating cavity. The heating element is composed from a flexible material with a very high positive temperature coefficient (PTC) that provides non-linear resistance with temperature with generally relatively low electrical resistances at temperatures below freezing and relatively high electrical resistances above freezing. A power source is coupled to the heating element. The very high PTC material of the heating element causes less power to be drawn by the heating element from the power source at higher temperatures above freezing than the power drawn by the heating element from the power source at lower temperatures below freezing to maintain a desired temperature of the TAT probe.

Abstract: Two pairs of regulating means, that is, the first stopper and the second stopper, which regulate a rotary angle range of the magnet holder when the first stopper and the second stopper come into contact with the stopper of the arm integrally fixed to the magnet holder, are provided in the body which is a fixing member, and the rotary angle range of the magnet holder regulated by one pair of stoppers is made to be different from the rotary angle range of the magnet holder regulated by the other pair of stoppers. Due to the foregoing, when the expensive body is made to be a common part and a plurality of types of inexpensive arms are manufactured, the fuel level gauge can be provided, an increase in the manufacturing cost of which is suppressed, which can cope with rotary angle ranges of the plurality of types of arms.

Abstract: The present invention relates to a segmented cylindrical tide staff system [11] for erection at remote areas for dynamic calibration of electronic tide meters and computer models of tides, said tide staff system consisting of plurality of cylindrical tubes [12], said cylindrical tube being coupled to a flange [13] at its end through a circular orthogonal hole [20] drilled on a flat surface of the flange, said flange being provided with plurality of equally spaced slots [15] drilled on the flat surface of the flange, an outwardly protruding tide indicating arm [14] being mounted on the flange wherein said tide indicating arm consists of two mutually orthogonal planes [22] and [23], wherein plane [22] is perpendicular to the axis of the tide staff and plane [23] is parallel to the axis of the tide staff, said perpendicular plane [22] being provided with a mounting terminal [21] and a circular

Abstract: A circuit board has an arcuate array of conductor segments each subject to a digital waveform differing in phase for the various segments, and a concentric pickup conductor. A rotary encoder disk has a conductive pattern which sums and couples the waveforms from selected segments, depending on rotary position, to the pickup conductor. A synchronous phase detector generates a phase signal from the summed waveforms and the zero crossing of the phase signal is detected. A counter develops count signals used to generate the digital waveforms. The count signals are input to a latch which is clocked at the zero crossing point to latch the count value which is a digital measure of the encoder angle.

Abstract: In a remaining fuel amount measuring apparatus, a CPU captures remaining fuel amount data detected by a fuel sender unit at prescribed periods through a voltage conversion circuit and A/D conversion circuit, compiles the captured remaining fuel amount data into blocks each composed of a prescribed number of data samples to be successively stored in a RAM. The CPU reads the block data as necessary and subjects the read data to data processing such as simple averaging, weighted averaging or removal of abnormal values. The CPU displays the remaining fuel amount after the data processing on a fuel meter.

Abstract: A modular scour monitoring device which employs magnets located within a weighted descending collar is designed for placement about bridge piers, abutments and the like, such that the occurrence of scour causes descent of the collar. This descent is carefully monitored against the initial reference point using one of two systems: a magnetic detecting probe unit or a magnetic switch array. The probe unit utilizes a graduated cable with a magnet detector mounted at one end and a signalling device at the other. The switch array system employs electrical components which are selectively activated with the descent of the collar, permitting periodic readings of the arrays various electrical properties to reveal the new depth. A wide variety of accessory systems may be used in conjunction with the present invention to permit remote monitoring, visual, audible or other warning signals, and data storage and control.

Abstract: A drop-weight material level indicator in which a spool is mounted above material whose level is to be sensed and is coupled to a motor for selectively unwinding and winding a drop line wound on the spool. The drop line is trained over an idler pulley carried at the end of a pivot arm, and over a second idler pulley to a drop weight. Level sensing electronics are coupled to the second idler pulley for measuring the amount of cable unwound as the drop weight descends toward the upper surface of the material. A magnet is carried on the pivot arm, and a reed switch is positioned adjacent thereto for sensing removal of tension from the drop line and consequent pivotal motion of the arm, and thereby indicating rupture of the drop line to an operator.

Abstract: A hermetically sealed tank gauge apparatus which continuously monitors the fluid level in a closed crude oil tank. A sensor device measures the liquid level in the tank. The sensor device communicates with the interior of the tank, and is isolated from ambient, so that no dangerous gases can escape from the tank, through the tank gauge apparatus, and into the surrounding atmosphere. The sensor device is arranged to continuously drive a recorder apparatus in response to change in liquid level thereof so that the quantity of fluid flowing into and out of the tank over a long interval of time can be ascertained. The sensor device and the recorder are tamper proof and enable accurate records of tank contents to be recorded.

Abstract: Apparatus for automatically recording the rate of fluid absorption of the soil includes three subsystems which may be easily assembled on site. During a test procedure the rate of descent of a float is recorded on a tape by a timer controlled marker.

Abstract: A tide level recorder records tide elevations utilizing a free floating graduated rod-staff, against a fixed index mark, simultaneous with a chronometer reading. The free floating graduated rod-staff eliminates mechanical errors evident in existing tide level recorders with counter weights and springs.

Abstract: This invention relates to an apparatus for measuring and recording the changes in magnitude of a variable. The apparatus includes a recording stylus or pencil and a means for carrying a recording medium such as marking paper. The stylus or the means for carrying is connected to a transducer means which follows the changes in magnitude and provides an output to drive the stylus along the width of the paper in one direction when the magnitude is increasing and in the other direction when the magnitude is decreasing. In addition, either the stylus or the means for carrying the paper are connected to rotating means which rotate in one direction only and which are also driven by the output of the transducer. As the rotating means rotates in one direction only, the stylus will produce a straight line along the width of the paper when the output of the transducer is in one direction, and a straight line at an angle to the first line, when the output of the transducer is in the opposite direction.

Abstract: This invention relates to a liquid level measuring and recording apparatus which includes a recording stylus or pencil and a means for retaining a record such as marking paper. The stylus is connected to a float means which follows the level of the liquid and drives the stylus along the width of the paper in one direction when the level is rising and in the other direction when the level is following. In addition, either the stylus or the paper are connected to rotating means which rotate in one direction only and which are also driven by the up and down movement of the float. As the rotating means rotates in one direction only, the stylus will produce a straight line along the width of the paper when the float is moving in the non-rotating direction, and a straight line at an angle to the first line, when the float is moving in the rotating direction.