An optical mirror support system is disclosed having a mirror supported by a plurality of supporting elements arranged along discrete contact regions so as to deform the mirror reflective surface in a manner producing a deformation pattern which qualitatively causes a diffraction pattern by the optical aperture having an idealized or optimized image quality. A preferred or optimized ratio of the distances between adjacent families of support elements and the distance between adjacent support ele...

A positive contact resistance soldering unit which has a relay therein, which is operated by a foot switch for selectively coupling a milliohmeter to the electrodes for measuring the resistance between the electrodes and the workpiece in order to determine the best contact therebetween. When the milliohmmeter indicates that the electrodes are in good contact with the workpiece the foot switch is depressed connecting the output of a power transformer to the electrodes to begin the soldering opera...

A class of power converters is disclosed for supplying direct current at one voltage from a source at another voltage which includes a simple passive circuit arrangement of solid-state switches, inductors, and capacitors by which the output voltage of the converter tends to remain constant in spite of changes in load. The switches are sensitive to the current flowing in the circuit and are employed to permit the charging of capacitance devices in accordance with the load requirements. Because so...

A load current sensor for use with a pulse width modulated power source and has an output filter inductor connected in series between a load and a pulse width modulated regulator. This inductor stores a portion of each pulse supplied to the load by the regulator. At the end of each pulse the stored energy in the inductor causes the current to continue flowing through the load via a freewheeling diode. This current is sampled by a sensor which is connected across the freewheeling diode and the se...

A method and apparatus is disclosed for bit synchronization of a received PCM communications signal, without requiring a separate synchronization channel in the communications signal by digital correlation of the received square-wave signal with a predetermined number of phase displaced replicas of its expected form. Each phase displaced replica is correlated with the input signal to determine which phase displaced replica produces the largest correlation signal. In carrying out the correlation ...

Nickel base alloys containing tungsten, aluminum, zirconium, and carbon in preferred weight percentage ranges have superior strength in the 2,000.degree.-2,200.degree. F. temperature range. This alloy has a nominal composition of 20% tungsten, 6.5% aluminum, 1% zirconium, 0.2% carbon and the balance nickel. 5 Claims, No Drawings

A method and apparatus for measuring the stagnation pressure of supersonic velocity gas streams without the generation of shock waves which interfere with such measurements. The technique is insensitive to type of gas and Mach number and is therefore particularly useful in the study of jet engine exhausts.

Apparatus for remote handling of materials. A closed housing is provided with first and second containers and first and second reservoirs for holding materials to be mixed. The materials are transferable from the reservoirs to the first container; in which they are mixed. The mixed materials are then conveyed from the first container to the second container preferably by dumping the mixed materials into a funnel positioned over the second container. The second container is then moved to a second...

Synthetic procedures to tetraalkyls, tetraacids and dianhydrides substituted 1,1,1-triaryl-2,2,2-trifluoroethanes which comprises: (1) 1,1-bis(dialkylaryl)-1-aryl-2,2,2-trifluoroethane, (2) 1,1-bis(dicarboxyaryl)-1-aryl-2,2,2-trifluoroethane or (3) cyclic dianhydride or diamine of 1,1-bis(dialkylaryl)-1-aryl-2,2,2-trifluoroethanes. The synthesis of (1) is accomplished by the condensation reaction of an aryltrifluoromethyl ketone with a dialkylaryl compound. The synthesis of (2) is accomplished b...

A REDOX cell to operate at elevated temperatures and utilizing the same two metal couples in each of the two reactant fluids is disclosed. Each fluid includes a bismuth salt and may also include a lead salt. A low cost, cation permselective membrane separates the reactant fluids.