A fluid-driven sensor for detecting and indicating the presence of a foreign object in the path of a fluid medium having a cylindrical vortex generation chamber, a supply port for introducing a driving fluid into the generation chamber, a vortex egress port communicating with a central portion of the generation chamber for permitting the driving fluid to escape from the generation chamber, and a sensing port by means of which the pressure within the central portion of the generation chamber is s...

Gas generator having a folded inflatable bag connected thereto, the generator having a plurality of pockets confining propellant. Electrical ignition devices ignite the propellant in two pockets first to release gas for deploying or partially expanding the folded bag. Propellant filled channels connect the two initially ignited propellant pockets to the remaining pockets for igniting the latter to release gas for inflating the bag to a desired pressure. A sublimable, vaporizable or decomposable ...

An aerosol is generated in the atmosphere by the use of a rocket wherein the internal pressure generated by combustion of a propellant is employed to force an aerosol-forming material carried within the rocket into contact with the stream of gases exiting from the rocket at velocities of at least Mach 1. The aerosol-forming material is injected through orifices into the said gas stream at pressures which are well above those prevailing in said stream at the injection point, thereby providing a h...

An illustrative embodiment of the invention converts two field-sequential color television signals to dot-sequential signals for combination into a composite color television signal. Through a feedback circuit connected to a field-sequential responsive image tube, a portion of the signal that characterizes one color is stored on the tube target while the image for another color is registered. This combined field sequential signal is taken from the target and is processed with another delayed fie...

This specification discloses a pulse-generating device including elements exhibiting bistable voltage vs. current characteristics, wherein said elements are connected in series with each other and with a variable power source, and a load is connected between the junction of said elements and an intermediate voltage portion of said variable voltage source. In this device, sharp electric pulses can be applied between the opposite ends of the load by changing the voltage of said variable voltage so...

An improvement in gear cutting methods and apparatus of the type in which a multiple-tooth gear is manufactured from a blank by the generation of successive tooth slots by a cutter which makes a plurality of cuts during the generation of each successive slot. The improvement comprises an alteration in the timed relationship between the cutting rate and the generating roll during successive tooth slot cutting operations such that the number of cuts made by the cutter differs from slot to slot. Wh...

A condenser discharge-type electrical pulse-generating circuit, such as for a combustion engine ignition circuit, wherein two storage condensers are charged in parallel to discharge across a relatively low voltage trigger gap which connects the condensers in series to discharge across a higher voltage control gap and through the primary winding of a transformer, the secondary winding of which is connected in series with a still higher voltage ignition gap, the ignition gap being connected in ser...

A thermoelectric generating assembly in which heat is produced by mixing air and fuel and causing the mixture to pass over a combustion member, the degree of heat being controlled by varying the amount of air and means being provided to equalize the air pressures at the air inlet to and the exhaust from the combustion chamber. The combustion chamber provides heat to a thermoelectric module comprising thermoelectric generating elements sealed in an evacuated space between walls having flexible po...

A condenser discharge-type electrical pulse-generating circuit, such as for a combustion engine ignition system, wherein two storage capacitors are charged in parallel and partially discharged in series through two control gaps and the primary winding of a high-frequency transformer, the secondary winding of which is connected in series with a high-voltage igniter gap and one of the condensers through one of said control gaps.

A pulse generating transformer circuit is provided for producing a series of uni-polar pulses of variable amplitude and duration, and in which the transformer is reset between successive pulses within a time independent of the product of the amplitude and duration of the individual pulses produced by the circuit. In this way, there is no limitation of the rapidity with which the successive pulses produced by the circuit may follow one another. The circuit of the invention achieves its desired pu...