Abstract: An electrode-inlead assembly comprises a small tungsten pin which is joined on axis to a fine molybdenum wire adapted to sealing through fused silica. The join is effected by a laser butt weld which permits a symmetric compact seal thereby making possible very small discharge envelopes having minimum end losses. The seal may be effected either by a foliated portion in the wire which is wetted by fused silica, or by a glass bead formed around the wire which wets both wire and fused silica.

Abstract: An yttrium-iron-garnet (YIG) tuned reflection filter is placed in the magnetic field adjacent a High Voltage Direct Current Transmission Line. A YIG filter receives a microwave signal from a remote transmitter and the same signal is modified by the YIG filter and returned to a remote receiver wherein the current in the transmission line is evaluated.

Abstract: A transistor test circuit provides for the selection of preferably three widely differing test frequencies for testing transistors normally having respectively relatively small, intermediate and large frequency gain-bandwidth product characteristics. These test frequencies are each much greater than the assumed normal cut-off frequency of the transistors to be tested thereby, and preferably only a fraction of the frequency at which the current gain of normal transistors would decrease to one. The test circuit is designed to form a linear amplifier circuit with the transistor under test and is provided with an automatic base drive control circuit which provides a substantially fixed predetermined DC collector current, despite wide variations in the current gain between different transistors being tested.

Abstract: A recording device which utilizes a closed loop servo system including a limited rotation motor, i.e. a moving coil galvanometer wherein the moving coil is activated by an input signal such that the rotational movement of a shaft supporting such coil may be translated into a graphic display for recording of the input signal. The device has specific utility in the recording of medical information wherein the input signal is created by the patient's body functions but has widespread alternate utility. The device further includes a transducer construction utilizing a rotational resistance mechanism including a rotating hub to which a contact arm is attached that creates a signal proportional to the position of the coil shaft and utilizes this signal for comparison with the input signal such that the coil position and thus that of the shaft may be corrected.

Abstract: A high-pressure gas discharge light source with high light conversion efficiency and color rendering, having a translucent discharge vessel of high melting point material in which electrodes of high melting point material are suspended and containing a filling of an inert gas or a mixture of inert gases, at least one metal halide and optionally one or more metals in the elemental state under cold conditions, wherein the ratio of the metal to the halogen forming the halide is stoichiometric or greater, and the specific wall load factor is between 25 and 200 W/cm.sup.2 and/or the quantity of the halide or halides is 0.01 to 1 mg per centimeter length of the arc.

Abstract: An electrical tester for circuit boards in which test pins are mounted in a support derived from a corresponding unloaded circuit board and in which wires to the test pin run slidably in interfitting pairs of plastic sleeves.

Abstract: A circuit for amplifying high frequency electromagnetic waves composed of a Josephson junction constituting an electromagnetic high frequency line along which electromagnetic waves can propagate at a signal frequency and at least one idler frequency, the junction being supplied with a direct voltage which modulates its associated Josephson current with respect to time, and with a magnetic field which modulates that current with respect to space.

Abstract: A parametric amplifier having a beam lead dual Schottky barrier diode fabricated on a single semiconductor chip across a waveguide cavity. Two anode leads are bonded to the adjacent waveguide walls for coupling to a pump source; and a common cathode lead is bonded to a signal circuit. Parasitic reactances are reduced by minimizing stray capacitance and beam lead series inductance.

Abstract: In combination with a meter movement having a pointer movable over a variable value indicating scale having numbered variable value indicating marks forming respective scale segments having substantially different compression or expansion ratios and representing progressively increasing variable values over the entire extent of said segments, a meter control circuit comprising respective amplifiers for controlling the variation of pointer movement over said respective segments of said scale, each of the amplifiers being capable of producing an output which reaches a maximum possible output level when the signal fed to the input thereof is of a value which is to move the pointer of said meter movement to the uppermost point of the associated segment of the scale, means for summing the outputs of said respective amplifiers and feeding the same to said meter movement.

Abstract: A turbomolecular pump coaxial with the drive shaftof a rotary anode in an ray tube is provided between the radial seal of the drive shaft and the high vacuum space surrounding the rotary anode. A pot-shaped shell mounted on the drive shaft where the latter passes through its bottom carries the rotor vanes, while the stator vanes are fixed on the tube casing. In order that the anode may be driven with the built-in electric motor located within the tube casing between the drive shaft bearings, at the high speed desirable for the turbomolecular pump, the rotary anode is cooled by water flowing through a set of closely adjacent helical ducts just inside of the working anode surface, running at a pitch of 10.degree. to 15.degree., fed with cooling liquid from radial ducts and a ring duct along one end face of a rotary anode and drained by another ring duct and another set of radial ducts along the other face of the rotary anode.

Abstract: The cylindrical peripheral wall (5) of a rotating hollow body mounted on a haft (1) driven by an electric motor within the stem casing of an X-ray tube is cooled with water supplied and removed respectively through co-axial ducts in the drive shaft, distributed by radial ducts in one end face of the rotary body to a ring duct and gathered from a ring duct at the other end face through another set of radial ducts leading back to the shaft. Between the two ring ducts the cooling medium flows through helical cooling ducts running parallel to each other and at an angle of about 15.degree. to the edge boundaries of the cylindrical operating surface. These ducts are formed on the outside by the anode peripheral wall material itself and on the inside by a stainless steel insert. The anode is degassed when its structure is soldered or brazed together in high vacuum at 1000.degree. C.

Abstract: An X-ray source having a cathode rotatable relative to the anode and a motor for rotating the cathode to produce a corresponding rotation of the X-ray beam emitted by the source.

Abstract: A voltmeter having multiple voltage ranges comprises substantially linear elements such that the transfer functions of the elements can be independently measured and logically combined to derive the transfer function of a given combination of elements configured to obtain a given voltage range.

Abstract: An analog to digital converter for use in a digital voltmeter includes a periodic source of reference signal in ramp form starting at a negative potential and increasing to a given positive potential. The ramp signal and an analog signal to be measured form the inputs for a first comparator which provides a given output level as long as the ramp signal is less than the analog signal. A source of clock signals and the output of the first comparator are connected to a first logic circuit which provides an output of clock signals during the period that the first comparator is at the given level. A second comparator is connected to the ramp signal and ground potential and provides a given output level until the ramp signal reaches ground potential. A second logic circuit is connected to the output of the second comparator and the first logic circuit and provides clock signals during the period that the ramp signal is above ground potential and less than the analog signal.

Abstract: A high-pressure discharge lamp having a hydrogen getter in the lamp vessel disposed in a metal envelope which is hydrogen-permeable. The hydrogen-permeable metal of the envelope is covered with a porous halogen-resistant layer. The atoms of the metal halides dissociated in the discharge can recombine at the porous layer so that blackening of the discharge vessel is mitigated.

Abstract: An X-ray tube including a cylindrical vacuum envelope at whose frontal or end surfaces are disposed the high voltage leads for the anode and the cathode. The vacuum envelope comprises a cylindrical metal member with at least one end surface face thereof being closed in a vacuum tight manner by means of an annular ceramic member with one of the high voltage leads, and possibly further leads, passing through the central opening of the annular member in a vacuum tight manner, so that the insulating path between the associated high voltage lead and the metal cylindrical member extends in a predominantly radial direction. Preferably the outer surface of the annular ceramic member forms an angle with a plane perpendicular to the longitudinal axis of the X-ray tube which angle is equal to or less than 45.degree., and more preferably equal to or less than 30.degree..

Abstract: A transformer primary is first biased with a current sustained at least long enough for any secondary voltage to drop to zero. Then the primary is open circuited. The resultant secondary voltage is coupled to a constant voltage device such as a shunt regulator. A voltage related to the shunt regulator voltage will then appear in the open circuited primary and will be available for measurement fully isolated from the secondary. If the shunt regulator is made to operate as a function of a condition to be measured, an isolated remote measure of the condition is present at the primary of the transformer.

Abstract: An X-ray tube is described in which, in order to produce a well defined electron beam which can be accurately focussed on the target of the tube, the cathode comprises a flat plate member, such as a tape or foil, the surface finish of which is sufficiently smooth that electrons are emitted therefrom with lateral energies below 0.2 electron volts. The aforementioned surface finish is such that irregularities in the electron-emitting surface of the cathode do not exceed one micron in amplitude.

Abstract: A gas discharge device containing at least two electrodes is shown, at least one of the electrodes being insulated from the gas by at least one dielectric insulating member containing a predetermined beneficial amount of an oxide of at least one lanthanide series rare earth metal or at least one actinide series rare earth metal. In one embodiment, a multiple gaseous discharge display/memory panel having an electrical memory and capable of producing a visual display is used, the panel having an ionizable gaseous medium in a gas chamber, formed by a pair of opposed dielectric material charge storage members, each of which is respectively backed by an array of electrodes, the electrodes behind each dielectric member being oriented with respect to the electrodes behind the opposing member so as to define a plurality of discrete discharge volumes constituting a discharge unit. Each opposing dielectric surface is coated with a metal oxide of the lanthanide rare earth series or the actinide rare earth series.

Abstract: The panel comprises a gas-filled envelope which contains a plurality of column cathode strips which are oriented parallel to each other, with insulating means dividing the surface of each such strip into a column of a plurality of separate operating areas including display cathode areas and priming or scanning cathode areas, the latter providing excited particles for use by the display areas. The column cathode strips, thus treated, form rows and columns of display cathodes and priming cathodes, and, in each column, there are gas communication paths between priming cathodes or areas and display cathodes or areas. In addition, there are gas communication paths along each row of priming cathodes so that each priming cathode, and each column of priming cathodes, can diffuse excited particles to adjacent priming cathodes.