A vortex generating element of the type used in flow metering apparatus and having a generally elongate cylindrical shape mounted in a stream of flowing fluid so as to produce Karman's vortices at a rate proportional to the velocity of the flowing fluid, with means detecting the production of vortices to give a linearly related measure of fluid velocity. To improve the correspondence of vortex production rate with flow velocity over wide conditions of flow, the element is formed on opposite side...

An apparatus for generating a gas jet of high velocity along a jet axis has a nozzle assembly coaxial with the axis and having a gas inlet thereon. Also provided, is an arcing chamber structure disposed adjacent to the nozzle assembly for transmitting the gas along the axis to the gas inlet. The nozzle assembly has two nozzle members one of which has a first nozzle passage coaxial with the axis and communicating with the gas inlet. The nozzle passage terminates in a nozzle opening. The two nozzl...

In a high voltage generating apparatus comprising a piezoelectric transformer element for generating a high AC voltage and a voltage step-up rectifier connected to the output electrode for generating a high DC voltage, there is provided a casing divided into two compartments by means of a partition wall for containing the piezoelectric transformer element and the rectifier respectively. Sealing means is provided between the periphery of the partition wall and the inner surface of the casing to e...

Characters are displayed on the screen of a cathode ray tube. The cathode ray tube electron beam is deflected in a trace representing the character to be displayed by sequentially applying various waveforms to the cathode ray tube deflection circuit. Digital control circuitry including a read only memory having segment deflection commands for each character to be displayed, shift registers set by the deflection commands, and AND gates enabled by the shift registers control the sequential applica...

A microwave oscillator including two semiconductor devices of a kind which can be switched between two state or which becomes unstable or exhibits negative resistance under the effect of an external electric field exceeding a given threshold value. The two semiconductor devices are mounted within a microwave resonant cavity and are connected in series between the poles of a dc bias voltage source. The common junction point between the semiconductor devices is ac-coupled to the microwave cavity s...

An assembly for an ozone-generating apparatus consisting of a cylindrical tube of constant thickness which is provided with an internal metal coating and which is characterized in that said tube, which is made of glass or of any other suitable material able to be used in an ozone-generating apparatus, is essentially open at both ends but fitted at one end (or both ends in some cases) with a removable plug which is formed of ozone-resistant insulating material and provided with an axial passagewa...

A surface generating system wherein a polishing electrode comprising a continuous stream of electrolyte is used to selectively polish an optical blank. During movement over the blank's surface, the electrode is selectively energized by a sensor element synchronously moving over a guide retaining information regarding contour errors on the surface blank.

An optical encoding apparatus in which selected ones of a number of light conducting members are illuminated by a movable, independently selectable member, is disclosed. This movable member carries a coded array of illuminating areas. Photosensitive devices are associated with each of the light conductive members to indicate the illuminated condition of a given member, or array of members, in response to their being illuminated by the illuminating areas of the movable member. These photosensitiv...

An autogeneously combustible composition that liberates hydrogen on burning contains an alkali metal borohydride and a hydrazine sulfate in proportions such that there are between about 0.5 to 2 boron atoms for each nitrogen atom.

A missile fuze arrangement in which a change in capacitive coupling between two mutually insulated conductive areas on the missile skin, arising from contact of one of those areas with a target body, results in a change in alternating current flow through that coupling from a generator to a load, the change in current flow providing an output signal to detonate the warhead of the missile.