Abstract: A roof drill assembly comprising a roof drill having a drill bit of a cylindrical configuration when used with a specifically designed drive rod and a means for retaining the drill bit within the drive rod enables a better dust removal during drilling and an increased load carrying ability of the shank. The drill bit body has two opposing symetrical lands including a web of uniform width extending across the diameter of the cylinder. The configuration forms a specific point angle, a chisel edge angle and a rake angle. The web contains a refractory metal carbide as a cutting surface and a shank extends from the body to engage a drive rod. The drive rod contains a tubular portion having an outer portion diameter compatible with the drill bit and an inner diameter to provide dust removal. A transition portion contains two channels that communicate from the opposing walls of the transition portion to the inner opening in the tubular drive portion that extends from the tubular portion.

Abstract: A photoflash unit comprising a plurality of high-voltage type flashlamps mounted on a printed circuit board containing circuitry for sequentially igniting the flashlamps in response to successive high-voltage firing pulses applied thereto. One lead-in wire of each of the flashlamps is connected to a common circuit conductor. An electrically conductive reflector unit is positioned between the lamps and the circuit board. The reflector unit is connected to the common circuit conductor by means of a pliable, electrically conductive adhesive material, whereby the reflector unit functions as an electrical shield for the circuitry.

Abstract: A tungsten-halogen lamp capsule is disposed within a curved reflector, the lead-in support wires for the capsule protruding through the rear portion of the reflector. After a front lens is sealed to the reflector, the lamp is energized and the beam pattern is adjusted by moving the support wires relative to the reflector. When the desired pattern is obtained, the wires are secured to the reflector.

Abstract: A circuit for selectively supplying current to the horizontal oscillator from one of two voltage sources. The first voltage source is primarily used to supply current to the horizontal output stage and supplies the oscillator only during startup of the horizontal deflection system. The second source is derived from a winding on the flyback transformer and supplies current to the oscillator after the startup period, that is, after its voltage or another or other voltages developed by sources derived from flyback windings have reached values sufficient to assure sustained operation of the horizontal deflection system. A startup detector responsive to a flyback-derived voltage determines which of the two voltage sources provides current at the output of the starting network, that is, at the power supply terminal of the horizontal oscillator.

Abstract: A direct drive electronic ballast circuit suitable for a fluorescent lamp load includes a high frequency oscillator inverter circuit having a tuned output circuit coupled to a load and to a drive circuit series connected to the load and dependent upon current flow therein. The high frequency oscillator inverter circuit is also coupled to a pulsed DC potential source which is shunted by a charge storage and isolating circuit energized by a feedback rectifier circuit which supplies energy whenever the potential from the pulsed DC potential source decreases below a given reference level. A relaxation type oscillator is coupled to the high frequency oscillator inverter circuit and provides a starting capability therefore.

Abstract: A vertical amplifier provides a deflection or yoke current independent of the yoke impedance or other impedances in the yoke current path. The amplifier comprises a general-purpose operatonal amplifier that develops an output voltage in a manner that maintains identical voltages at its inverting and non-inverting inputs. A feedback resistance is connected in the yoke current path, thereby developing a voltage indicative of the yoke current. As a result, the yoke current waveform can be made identical to or a desired variation of a current commanding voltage waveform applied to the non-inverting input. A particular variation of the feedback resistance transforms an S-shaped current waveform into a sawtooth voltage waveform, thereby providing the desired deflection linearity.

Abstract: An electronic ballast circuit includes a direct drive high frequency inverter circuit with a tuned output circuit and a drive circuit dependent upon current flow in a load circuit. The high frequency inverter circuit is coupled to a DC potential source which is derived from a pulsed DC potential source by way of a charge storage and charge isolating circuit. An oscillator provides a starting capability for the high frequency inverter circuit and is essentially removed from the active circuitry upon energization of the high frequency inverter circuit.

Abstract: In a television receiver containing both circuitry returned to the AC line and circuitry returned to an isolated chassis ground, a voltage supply isolated from the AC line for a horizontal oscillator returned to the chassis ground. The supply is developed by a winding magnetically coupled to an inductor in a switching regulator that is coupled to the AC line and operates at a frequency substantially equivalent to the horizontal oscillator frequency. With the horizontal oscillator operative, supply voltages for the remainder of the receiver's line-isolated circuitry can then be derived from windings on the flyback transformer.

Abstract: A mounting package for electrical components includes a printed circuit board with a conductive pattern and solder on one side for attaching wires extending through spaced holes, an electrical component with connecting wires, electrical wires, and an insulator frame with apertures and connector pins aligned with the spaced holes of the circuit board wherein the connecting and electrical wires selectively extend through the apertures and are affixed to the connector pins with the wires and connector pins passing through the holes and soldered to the printed circuit board.

Abstract: A photoflash lamp unit having an array of eight flash lamps located on each of two opposing sides thereof. Each array comprises two regions, upper and lower, of four lamps. A pivotal mounting device at a lower end of the unit permits the four lamps in one upper region to be fired after which the entire unit is rotated and the four lamps in the remaining, opposing upper region are fired. The unit is then inverted and the eight lamps in the two previously lower regions are fired in the manner described above.

Abstract: A signal strength meter circuit for an FM radio receiver employing automatic gain control. The signal strength meter circuit includes circuitry for establishing a range of voltages on an AGC line of the receiver corresponding to a range of signals received by the receiver and for providing deflection of a needle of a signal strength meter over the entire range. At such time as AGC circuitry in the receiver draws current from the meter circuit, the meter continues to display this current by the deflection of the needle of the meter.

Abstract: Extra fine cobalt metal powder (up to about 0.8 microns) having less than 100 parts per million cation impurities is produced by a process in which cobalt pentammine chloride is digested in a dilute ammonium hydroxide solution to form a black precipitate, which is separated and heated in a hydrogen atmosphere to reduce the precipitate directly to cobalt metal powder. The cobalt pentammine chloride may be obtained by digesting a cobalt source in hydrochloric acid, adding ammonium hydroxide, oxidizing the cobaltous ion to cobaltic ion, and reducing the pH with hydrochloric acid to less than 1.0 in order to precipitate cobalt pentammine chloride. The final cobalt metal powder is useful, for example, as a starting material in the manufacture of cemented carbides.

Abstract: A process is disclosed wherein essentially all of the rhenium can be removed from an aqueous solution of molybdenum without the extraction of molybdenum using a particular solvent extraction solution. The extraction solution consists essentially of quaternary ammonium compound and at least about 50 percent by volume of a highly aromatic solvent which dissolves a quaternary ammonium-rhenium complex to the extent of at least 0.1 percent by volume selected from the group consisting of benzene and an aromatic solvent containing primarily lower alkyl benzenes having molecular weights of either 106, 120, 134 or 148 with minor amounts of relatively long chain aliphatic hydrocarbons containing greater than 8 carbon atoms and minor amounts of napthalene.

Abstract: A shutdown circuit both electrically and magnetically isolated from the horizontal deflection circuit and the flyback transformer. The voltage across a winding magnetically coupled to an inductive element carrying the current required by the deflection circuit and the flyback transformer is detected. The horizontal deflection circuit is disabled in response to voltages above a predetermined value. In an Iso-Hot type receiver having an oscillator coupled to the deflection circuit by an optically operating drive circuit, the drive circuit is rendered optically non-transmitting.

Abstract: A DC circuit for efficiently operating two arc discharge flashlamps. The lamps are parallel connected across a single supply storage capacitor, and a single trigger capacitor is employed in connection and the two alternately activated trigger sources for the two lamps.

Abstract: A translating mechanism for accurately positioning and locking an object relative to a reference plane comprises a base plate which defines the reference plane and a platform supported parallel to the base plate for movement in a direction perpendicular to the plane of the base plate. A spring between the base plate and platform urges the latter away from the plate and an adjustment screw operably connected to the platform and to the plate permits changing of the spacing between the platform and plate against the bias of the spring. Nestable U-shaped arms pivotally connected to the plate and platform, respectively, and to each other directly slideably engage the plate and platform, and maintain parallelism therebetween during their relative movement. A flexible end wall adjacent to the platform releasably clamps the platform against the opposite end wall to lock same in any position within its range of movement. This also minimizes the load path length between platform and base.

Abstract: A mount for an arc discharge lamp has a cathode thereon which is encircled by a disintegration shield. There is a gap in the shield and a mercury-containing glass capsule disposed proximate the gap. The capsule is supported on the shield by means of an axial wire in the capsule extending beyond both ends of the capsule and welded to the shield. A crack in the glass permits the mercury in the capsule to develop a vapor pressure in the lamp.

Abstract: The utility of a coaxial electret cable transducer as a hydrophone at shallow depths (low hydrostatic pressure) is extended for operation at substantially greater depths (high hydrostatic pressure) by the combination of the electret with a polymer material having piezoelectric properties, i.e., a piezoid. The electret and piezoid are separate flexible materials radially stacked within the cable or alternatively and preferably constitute a single material formed to have both electret and piezoelectric properties. One substance useful as the piezoid or as the electret-piezoid combination is polyvinylidene fluoride (PVF.sub.2).The invention also comprehends the method of measuring underwater soundings at either low or high hydrostatic pressures with the aforementioned coaxial cable as an electrostatic transducer by measuring electrical signals generated across the cable conductors when the ambient pressure is low and as a piezoelectric transducer across the conductors when such pressure is high.

Abstract: An electric lamp comprises a reflector envelope having a sealed tungsten-halogen lamp disposed therein. The lead-in conductor supports for the lamp extend through, and are connected to, metal eyelets which extend through holes in the reflector and are fastened to the reflector.

Abstract: A laser pumping assembly with a housing having a removable heat resistant glass liner or shell enclosing a pump and a laser rod comprises removable glass or quartz plates over opposite ends of the shell together with a heat absorbing shim between each end plate and an adjacent heat conductive support plate attached to the housing. The outside surface of each end plate is coated with a dielectric layer which reflects the desired wavelength of pump lamp radiation inwardly of the shell toward the laser rod and transmits undesired wavelengths to the adjacent shim. The shims are held tightly against the end plates and pass heat from the unreflected pump lamp radiation to the respective support plates for dissipation in the cooling system.