Abstract: An evacuated, double-walled, tubular housing contains a sheet metal fin which is biased against the inner tube. A metal tube carrying the fluid to be heated is placed in heat transfer relationship with the fin. A plurality of collectors can be placed in an array with the fluid carrying tubes the only connection.

Abstract: Ceramic electrode is brazed to compliant support, a plurality of curved metal strips mounted on edge, opposite edges being brazed to cooling block. Compliance permits expansion and distortion of electrode when heated without development of stress damaging to brazed joints or to electrode.

Abstract: A vapor generator supplies vaporized motive fluid to a prime mover which drives a load. In the embodiment of this disclosure the primary load is the electrical load on an alternator. A sensor provides a continuous signal representative of the load. Responsive to this signal the flows of motive fluid and fuel and air to the vapor generator are modified. Additional modifications to the flows are made responsive to signals representing the temperature and pressure of the vapor leaving the vapor generator.

Abstract: Magnetohydrodynamic devices using hot ionized gas as working fluid require channel refractories, insulators, and electrodes to be cooled at their reverse sides in order to carry away heat flux fast enough to keep obverse sides below melting point, since gas temperatures of roughly 2500.degree. C. exceed melting points of any available metals or ceramics. Common procedure of brazing ceramic to metal backing (which is more conveniently fastened in apparatus and cooled) creates only partially solvable problem of differential thermal expansion, or bad fit. Ceramic reverse is grooved with dovetailed or convergent slots against which brazing stock is placed for brazing to metal backing. During brazing, molten braze alloy enters grooves and forms mechanical lock which on test proves stronger than ceramic itself.

Abstract: Copper backings brazed to ceramic parts exposed to high-temperature oxidizing high-velocity gases must be secured, for mounting purposes, to water-cooled fixed support, with high thermal conductance between backing and support. Prior art practice of brazing backing to support is inconvenient, making subsequent removal difficult, and disadvantageous in requiring that support be heated to brazing temperature (which may weaken support by annealing it). Invention teaches channel-shaped clip, on back of backing, whose legs are spread slightly to be inserted in mating slots in support face. All mating surfaces are tinned with lead-tin eutectic solder. If mere mechanical contact provides adequate thermal conductance between backing and support, solder remains unmelted; but if mechanical contact is imperfect temperature of backing will rise, and solder will melt and bridge gap between backing and support, raising thermal conductance.

Abstract: The electric terminals or leads of photovoltaic devices to be interconnected into an array are encased in the insulating layers of the devices. Guideholes pass through the devices and the terminals. Fasteners having an insulated head and shank with a conductive means on the shank are positioned so that the conductive means is in contact with the terminals. Screw and nail type fasteners are disclosed.

Abstract: Precise control of size and location of cathode-ray image, especially of projected image may be required for various reasons, but particularly when images from several different sources are to be matched contiguously to produce apparently continuous image, and when extreme accuracy of linear dimensions on picture is required.Edges of image normal to each scan direction are provided with markers, such as light bars. Photosensors at edge of useful picture area sense such markers. Sum of sensings of opposed photosensors is measure of displacement of picture in direction of line joining photosensors. Difference between sensings of opposed photosensors is measure of extension or contraction of picture in that direction. Sum signal is used to control centering; difference signal is used to control scan amplitude in given direction.

Abstract: A bed of beads is placed in the path of the air flowing to the tubing of the condenser. Water is sprayed on the bed so that it will be evaporated and so cool the air below the dry bulb temperature.

Abstract: The rotor of the expander has axially extending slots containing vanes which reciprocate generally radially as the rotor turns since the rotor is eccentrically mounted in a casing. Vapor distribution ports extend from the base of each slot to the surface of the rotor forward of the slot. Axial passages for admitting pressurized, high temperature vapor from the ends of the rotor intersect with the vapor distribution ports at a point between the ends of the ports.Annular bearing elements are contained in the endwalls and lubricating oil is provided directly to them.

Abstract: From stored environmental digital data giving coordinates of terrain features such as ridges and valleys and their associated brightness and color there is selected data on features lying in a vertical plane extending from a center which is the ground position of an elevated viewpoint. By data-processing means, the terrain elevation profile and the color profile for the vertical plane are generated. These profiles are then converted to a radar intensity profile by incrementing a ground sweep or to a perspective color profile by incrementing the view angle sweep. The process is repeated for each next adjacent sector until the entire desired azimuth range is covered. Presentation means is swept vertically, reproducing stored terrain profile patterns, with successive vertical sweeps lying side by side. Using equal angle increments for successive azimuth angles gives perspective representation for a spherical display.

Abstract: Gross, U.S. Pat. No. 3,842,350, teaches satellite communication system in which subscribers are connected to each other by appropriate assignment of two different transmitting frequencies to two parties, each being assigned a receiving frequency matching other's transmitting frequency. When third party (in commonest case, operator) must communicate with both subscribers, prior art requires operator to have as a minimum two receivers whose outputs are mixed to operator headset and two transmitters fed from operator microphone. One pair of operator transmitter and receiver communicates with one subscriber, the other pair communicates with other subscriber; but subscribers can not communicate with each other. This is somewhat inconvenient for operator intervention and, of course, intolerable if a conference connection is required.

Abstract: Ground terminal serving a number of individual telephone lines in a local region converts their signals to an intermediate frequency. If called station is in remote region linked by relay satellite, intermediate frequency is selected in band dedicated to conversion to (or from) satellite frequency band by frequency converters. If called station is in local region, intermediate frequency is selected in a different band dedicated to local traffic. Frequency-selective filters automatically route signals in satellite-dedicated intermediate frequency band to (or from) satellite-linked channels, and signals in local-traffic-dedicated intermediate frequency band to a channel common to local lines, eliminating need for switching between two kinds of channels. Two local-region telephone lines may be linked by appropriate intermediate-frequency assignments, thus performing function equivalent to ordinary telephone exchange.

Abstract: A vapor generator vaporizes a motive fluid which is used to drive a multivaned rotary expander. The expander is the prime mover for an electric generator which may be an alternator. Exhausted vapor from the expander (or if the expander is not being operated, vapor from the vapor generator) is passed through a heat exchanger where a fluid, e.g. air or water, is heated. This heated fluid is used for space heating. The expander may also be connected to drive the compressor for an air conditioning system. Alternatively, an electric motor may be employed for this purpose.

Abstract: A motive fluid composed of ethyl alcohol, distilled water and one of several buffering agents such as pyridine is disclosed. The fluid is compatible with aluminum, ductile iron, and mild and carbon steels.

Abstract: In one of the embodiments disclosed, apparatus is provided for communicating, in digital form, information from a plurality of analog sources located in a borehole to a location on the surface. A multiplexer is provided with a plurality of inputs for connecting the analog signal output of the data sources to an analog to digital converter in response to a sequence control circiut. The analog to digital converter converts the analog signals to digital data signals. A digital address signal is added to each data signal indicating the source of the data. The digital data signals and their addresses are applied to modulate or vary the power factor of power on a power cable mounted in the borehole. Receiver means is provided at the surface location for recovering the digital data and address signals for use on the surface. These signals may be displayed by display means, stored or used in a computer.

Abstract: The beams from a plurality of off-axis guns aimed through a common deflection volume, as used in shadow-mask color cathode-ray tubes, even if made by constant convergence fields to converge at a given distance in the absence of deflection, will diverge when a common deflection field is applied; and the distance from the deflection zone to different parts of the screen is generally not constant.Therefore the convergence field applied to each must vary as the beams are deflected to different screen areas. Prior art schemes to do this have employed functions of the form AY + BY.sup.2 + CX + DX.sup.2, where Y is the vertical deflection and X is the horizontal deflection. The present invention produces a function AY + BY.sup.2 + CX + DX.sup.2 + EXY, or alternatively this function plus FY.sub.+.sup.3 where Y.sub.+ is only the positive value of Y. The square and cube functions are produced by the use of multiplier circuits.

Abstract: A power line data transmission system is disclosed in which data is transmitted over a line carrying alternating current power by varying or modulating the power factor of the line or the phase angle of the power on the line in accordance with a signal to be transmitted. A series connected reactance and switch are connected across the line. The switch is turned on and off in response to the data signal to be transmitted over the line. The phase angle of the voltage and current on the line is detected at the receiving location. The phase relation between the voltage and the current is detected or compared to produce a binary digital signal corresponding to the data sent over the line. The detection of the voltage and current being out of phase by a predetermined amount may be used to generate a signal indicating a digital one. The detection of the voltage and current being in phase may be used to generate a signal corresponding to a digital zero.