A device for detecting position coordinates of patterns such as graphs and characters which are plotted on a drawing media. The device includes a tablet on which a plurality of conductive lines are installed parallel to each other, and a probe positionable for selecting a position coordinate. The probe comprises circular coils which are in a mutual inductive relation with the conductive lines. The device determines the coordinate of the probe relative to the tablet by selecting and filtering a m...

A highly-amplified pickoff signal responding to positional deviations of a wire-suspended gyro are fed to a torquer connected to the gyro. In response to these the torquer exerts on the gyro a torque counteracting the gyro directing torque. The pickoff signals are sampled at time internals T and an analogue-digital converter produces therefrom a timed sequence of digital signals with each digital signal being proportioned to the pickoff signal at a time of sampling. This sequence of digital sign...

A compact electronic calculator having the function of extracting cubic roots comprises a first register for storing therein a number, a circuit for dividing the number in the first register at every three digits and effecting subtraction therefrom, and a second register for storing therein the data provided by the dividing circuit.

The invention provides a method and apparatus for determining the concentration of an element such as a heavy metal in a matrix of a material such as rock by the X-ray or gamma-ray fluorescence technique. It allows the use of this technique where a sample to be analyzed has a rough or jagged surface. The effect of the rough surface is eliminated by adjusting the distance between the source and/or detector from the sample so that the rate of detection of radiation in a reference energy band is ma...

A relay system for relaying hyperbolic navigation signal information received at a mobile. The mobile has a simple relay transmitter and receives signals which are radiated from different navigation transmitters in turn on a single frequency f.sub.rf. The received signals are heterodyned to a single audio frequency f by mixing with a locally-generated or transmitted signal f.sub.o. Phase errors are minimized by transmitting the information as phase changes of the single frequency f signal in a s...

A device particularly suited for use in optics, having a planar sine plate mounted for rotation about a lateral axis, with the sine plate being capable of holding an optical device such as a diffraction grating. A pivot arm member is mounted for rotation about an axis perpendicular to the axis of rotation of the sine plate, and is in contact with the end of the plate over a portion of its rotational displacement. A calibrated drive such as a micrometer is mounted in position to make contact with...

A hollow lightweight housing is provided, adapted for ready location on a horizontal surface such as a counter top adjacent a stove or oven. A set of food information bearing cards are carried by a rotatable assembly mounted within the housing, enabling selective presentation of any one of the cards to the ready view of the user. Mounted on a generally horizontal wall of the housing is the pushbutton portion of a digital calculator, the display of which is closely located to the cards when locat...

Triglycerides are determined by enzymatic saponification with lipase in a buffer in the presence of a carboxylesterase and an alkali metal or alkaline earth metal (10-15 carbon atom) alkyl sulfate, in the additional presence of a compound of the general formula RO(CH.sub.2 CH.sub.2).sub.n H, in which R is alkyl or alkenyl containing 14 to 20 carbon atoms and n is a number of from 7 to 20; this determination prevents turbidity and does not disadvantageously influence enzyme activity.

A system for ascertaining the bearing of a remotely-located acoustic signal ource including a hydrophone array having an omnidirectional hydrophone and a pair of orthogonally-oriented directional hydrophones all of whose output signals are applied to a processor which combines the output signals of the directional hydrophones to provide a signal shifted in phase relative to the omnidirectional output signal by an amount equal to the bearing angle and which resolves the phase-shifted signal by ph...

A system for continuously determining the eccentric characteristics of a tube wall, including a positioning assembly supported by the tube when it travels in its lengthwise direction. Two thickness sensors are supported by the positioning assembly and have sensing axes disposed in a predetermined angular relation with respect to one another about the periphery of the tube. The two sensors continuously measure the wall thickness of the tube at the predetermined angular locations as the tube moves...