A meter face arrangement for use with a cross wind sensor that provides information indicating relative airspeed with respect to a probe, and also the direction of the relative wind, which permits an operator of an aircraft such as a helicopter pilot or an operator of a levitated vehicle or an observer in a ground installation to determine the relative movement of the air and also the relative direction of movement. The meter face is made so that the indicator will visually provide the direction...

A relative humidity measuring instrument includes two spaced electrodes on an insulating substrate which is mounted on a Peltier-effect thermoelectric module. When the substrate is cooled by the thermoelectric module, a comparator connected to the electrodes on the substrate detects a decrease in resistance between said electrodes due to condensation of moisture therebetween. Then a microcomputer receptive to temperature signals from a thermometer on the substrate and an ambient thermometer comp...

Relative movement is detected by directing light through an apertured baffle to form a beam which strikes a pair of adjacent photosensitive devices. Transverse relative movement of the baffle moves the beam to change the relative amount of light striking the photosensitive elements to generate a signal indicative of the displacement of the baffle. A beam-splitting shield may be located between the baffle and the photosensitive elements to increase the sensitivity of the apparatus.

An electronic device for determining the relative speed between two units--vehicles or the like--by utilizing the Doppler effect. A transmitter would be located in one vehicle to transmit on a given frequency but also to transmit an encoded number corresponding to the transmitting frequency. The receiver, by detection of the shift between the coded number and the received frequency would determine the relative speed between the transmitter and the receiver.

Apparatus for measuring relative humidity within a given environment includes first and second operational amplifiers connected in a positive feedback loop. The first amplifier supplies an input signal to the second amplifier enabling the second amplifier to provide an amplified output signal which is fed back to an input of the first amplifier. First and second thermistors, which sense dewpoint and ambient temperatures, respectively, within the environment, control the gain of the second amplif...

In a bridge circuit providing direct reading of relative humidity, a voltage is produced across a potentiometer corresponding to the difference between ambient temperature and a reference temperature. A galvanometer is connected between the movable tap of the potentiometer and a potential produced by the bridge circuit corresponding to the difference between the wet and dry temperatures. The position of the movable arm of the potentiometer, when the bridge is balanced, directly indicates relativ...

An improved humidity sensing element of the electrical resistance-dependent, metal oxide type in which the metal oxide is sintered to achieve a stable cross linked porous metallurgical matrix. In the preferred embodiment, the humidity sensing element of the invention is produced by coating a dielectric blank to which an electrode system has been applied with a metal oxide selected from a group including the oxides of Group VIII, Period 4 of the Periodic Table, preferrably Fe.sub.2 O.sub.3, apply...

Relative sliding members comprising as materials in combination a nitrified sintered alloy and an alloy cast iron, chemical components of which are well selected in percentage so as to provide better wear resistance and machinability.

A device has a composite mandrel assembled of separate independently movable members, such as of telescopically joined tubes. Each tube is spring-loaded in the direction of contact of the mandrel with parts to be oriented. During the successive contact of the composite mandrel with the parts being oriented each part, while cooperating with one of the tubes of the mandrel depending on its size (diameter of the part), is positioned strictly coaxially with the common axis of the mandrel which repre...

An arrangement for indicating a relative azimuth between two objects remote from each other, such as a control station and a mobile unit remotely controlled by the station, on which are respectively mounted first and second synchronous transmitters for generating and transmitting their respective signals corresponding respectively to true azimuths of the station and the unit. The control station is further provided with a relative azimuth indicating device including outer stational and inner rot...