Abstract: A multiport phase shifter for microwave energy provides four output components of an input wave each shifted a prescribed amount in phase, in an enclosure having two plates held together by studs mounted on one of them for locating a power divider and four independent phase-shift branches, and independent diode mounts for each, and for spacing the plates the correct distance to serve as ground planes for TEM-mode lines within the enclosure. Phase trimmers at each output port serve to adjust the output phase relations to a specification without requiring any invasion of the enclosure.

Abstract: Metal-silicide-silicon Schottky barrier diodes are made by a process which yields the characteristic of low barrier height, in the region of 0.15 volt, suitable for use without dc bias as a detector at microwave frequencies. Low barrier height metals, such as palladium, platinum and hafnium are processed through heat treatment steps which reduce the barrier height below that which is typical of point contact diodes.

Abstract: Apparatus for producing a graph of a function represented by a varying analogue input signal supplied to the apparatus, comprising display means adapted to display in a graphing operation the graph of the function, calculating means adapted to receive the analogue input signal and to calculate the value of a parameter of the function, and control means operable to interrupt the operation of the display means at preselected points in the graphing operation and to cause the display means to display the value calculated by the calculating means and thereafter to resume the graphing operation.

Abstract: A thyristor pulse controller having an electromagnetically actuated shorting contactor comprising an actuating coil and an armature which moves on energization of the actuating coil to close the contactor tips and which moves on de-energization of the coil to open the contactor tips and to create an air-gap in the magnetic circuit of the coil, is provided with an interlock circuit comprising a voltage sensing circuit connected in parallel with the contactor actuating coil, the voltage sensing circuit being adapted to provide an output signal when the modulus of the voltage across the actuating coil exceeds a predetermined value which is lower than the modulus of the voltage across the coil at the instant when the contactor tips open. A unidirectional current path, which may be provided by the interlock circuit itself, is connected across the actuating coil to discipate inductive energy in the coil when the contactor opens.

Abstract: A headbox of the pressure nozzle type has a slurry distributor providing a plurality of pairs of separated slurry passages arrayed in the cross-machine direction. The passages of each pair open at their input ends to a manifold located at one side of the distributor. Within the distributor each passage turns at a sharp angle and all the passages are aligned in the machine direction at their output ends. A nozzle structure of a turbulence-generating type is shown coupled to the distributor.

Abstract: A personal paging device is housed in a case which has one dimension (length) longer than its width or thickness, and a clip is affixed to a side on a swivel between the ends of the length dimension, which allows the device to be worn on the person in a vertical or a horizontal posture. A radio receiving antenna is carried on a flexible dielectric sheet within the casing, and radio components are enclosed within that sheet. A pair of orthogonally-related antenna loops can be provided on the dielectric sheet. The swivel clip can be arranged to cooperate with these or other antennas in a circular-polarization antenna system, such that in one orientation one or the other of the antennas will be detuned.

Abstract: A linear filter network incorporating active elements, and which obeys the relation f.sub.t .varies..sqroot.G.sub.1 G.sub.2, where f.sub.t is the band-pass center frequency of the network; and G.sub.1 and G.sub.2 are the conductance values of certain network circuit elements, has its transfer function for bandpass output controlled by a group of switchable conductances (G.sub.1 G.sub.2) in a digitally-controllable switching system that reduces the number of conductances required to achieve a given number of discrete pass-bands all having the same, or constant, bandwidth. A network that is switchable among 10 or more frequencies is used in a tone-responsive paging system for response to one or more of a series of calling tones or frequencies that follow each other in equal frequency intervals or steps ".DELTA.f" chosen so that for a series of "n" steps no tone in the series is harmonically related to any of the others.

Abstract: A new scintillator composition, consisting essentially of di-m-methylphenyl-1,3,4-oxadiazole, or 2,5-di-m-tolyl-1,3,4-oxadiazole, is prepared by reacting m-toluoyl chloride with hydrazine to form di-m-toluoyl hydrazine which, in turn, is reacted with thionyl chloride to form the desired product which is dissolved in an organic solvent. The scintillator, di-m-methylphenyloxadiazole compares favorably with present commercial products, being equal to or better than diphenyloxazole in most important respects and significantly superior in scintillation pulse height and in stability. It can be produced at a fraction of the cost of today's most widely used product.

Abstract: Method and apparatus are described for producing a replica of a pattern composed of differently-colored zones, mutually exclusive areas of the replica being so encoded from zone to zone that when it is suitably illuminated, the light from each zone can be treated separately from the light from each of the other zones. Apparatus is also described for reconstructing from such separately treated light an image of the original pattern in which each zone may be given an arbitrary hue and intensity. The "color" of any one zone in such image can be black or white, as well as gray.

Abstract: A Fourdrinier steam shower positioned over the wire includes a steam distributor pipe extending across the path of motion of the machine wire and fed with pressurized steam. This steam pipe is connected to support members in the Fourdrinier machine. Positioned around said steam pipe for the width of the machine wire is a steam distributor including legs extending downward and outward from the pipe at an angle so as to define and enclose a steam chamber open at the bottom. Steam enters the steam distributor from jets in the steam pipe and is directed through a tortuous path into the steam chamber. Water collecting in the legs of the steam distributor is discharged through drains located at the bottom of each leg.

Abstract: In an optical apparatus of the Fourier transform type employing a plurality of individual light sources arrayed about the optical axis of the apparatus, a control subsystem for all the light sources samples light from the light sources selectively. In the illustrated embodiment, a pellicle deflects a minor fraction of the source light to a spatial filter which passes a selected sample or samples to a group of spectrally filter photodiodes, which respond with currents that are fed to a photometric circuit and means to display measured quantities to an operator. The apparatus includes operator controllable means to adjust the intensity of each supervised light source independently of the others. A primary light source, from which the individual light sources are derived, is also supervised, to provide a basis for taking into account variations in energizing voltage, and dimming of the primary source with age.

Abstract: Computing apparatus for producing a digital output equal to ##EQU1## where N.sub.1 is a preset digital factor and V.sub.1 and V.sub.2 are analogue input signals. The apparatus includes a pulse generator arranged to receive in turn each of the signals V.sub.1 and V.sub.2 and to generate pulses at a frequency proportional to the magnitude of the signal, a counter for counting pulses received from the generator, timing means for measuring the time T taken for the count in the counter to reach the value N.sub.1 when signal V.sub.1 is applied to the pulse generator, means for resetting the counter, and means for extracting the count in the counter after a time equal to time T has elapsed during a counting operation with signal V.sub.2 applied to the pulse generator.

Abstract: A hard, tough, strong ceramic body is formed by hot pressing a mixture of a powdered metal and a powdered metal diboride. The metal employed is zirconium, titanium or hafnium and the diboride is the diboride of a different member of the same group of zirconium, titanium or hafnium to form a ternary composition. During hot pressing at temperatures above about 2,000.degree.F., a substantial proportion of acicular ternary monoboride is formed.

Abstract: In apparatus powered by electric batteries (e.g.: a paging receiver) having a battery compartment including means to couple the battery in it with a battery charger, the negative (-) charging contact is located at a position nearer to one end of the battery compartment than to the opposite end. A rechargeable battery (e.g.: Ni Cad) has a band of its insulated cover removed at a corresponding position so that the negative charging contact can touch the underlying portion of the battery container, and through that connection the charging circuit can be closed. The charging circuit cannot be closed if the battery is inserted with its polarity reversed. When a non-rechargeable battery is installed the recharging-circuit contact mates with a part of the insulation cover of the battery and the charging circuit cannot be closed. In one disclosed embodiment of the invention, if either battery is installed with its polarity reversed, the energizing circuit from the battery to the radio apparatus will not close.