Abstract: An impulse generator includes two pairs of contacts and one indexing disk whose indexing notches are capable of moving a central resilient indexing element. The indexing element moves either toward the one or the other pair of contacts depending on the rotation of the indexing disk. Each pair of contacts is a separate contact spring assembly (15, 16; 17, 18). The indexing disk is positioned above the contact springs (15, 16; 17, 18). The indexing element is a spiral spring (10) clamped either at one or at both ends, and disposed in such a way that the centerline (14) thereof extends in relation to the indexing notches (12' and 12) so that the latter deflects the spiral spring (10) laterally toward the contact springs (15, 16; 17, 18). The spiral spring (10) is laterally deflected to actuate the respective inner contact spring (16, 17) of a contact spring assembly (15, 16; 17, 18). This results in reduced abrasive by wear of the indexing disk, and insures that a good electrical contact is reliably made.

Abstract: A video image of a relatively simple nature is produced by scanning using a conventional TV camera (1), and the scan results are converted into a Cartesian co-ordinate form for image analysis. This involves seeking a point of interest during the scan, the number of scan steps along a scan line as indicated by a counter (11) defining the point's location along the line. The point of interest's location in the other co-ordinate is indicated by the setting of a scan line counter (6). After each detection of a point of interest its location is indicated to associated equipment and the scan is resumed. As described this is used in an eye follower of the type described in our U.S. Pat. No. 1,581,018 the image analysis being used to assess the directions in which the eye is looking. The result of this assessment is used to exercise a controlling function or a machine or other device, e.g. to enable a disabled person to control such a machine or device.

Abstract: A wash-tight electromagnetic relay having a housing including a bottom part and a cover part. The cover part includes a top side in which a spigot projecting inwardly toward the relay is formed and which defines a borehole extending through the spigot to a spigot bottom having an opening. The borehole opens outwardly from the cover part permitting a ball to be tightly pressed therein. The bottom part is sealed to the cover part by a sealing material and the relay interior is degassed to exhaust gas contaminants, filled with an inert atmosphere and sealed by the ball to prevent the entry of further gas contaminants.

Abstract: A broadband TEM mode four-port hybrid in a single-level microwave circuit in a transmission line medium selected from among the stripline, microstrip, airstrip, etc. media. The device employs coupled strip all-pass filter elements to provide a hybrid wherein isolation to the cross ports, power division to the coupled ports, and the 0.degree. and 180.degree. output phase relationships are independent of frequency over substantial frequency bandwidths.

Abstract: An improved system including a circuit for igniting a pilot burner each time heat is called for by a thermostat. The main burner is ignited by the standing pilot upon detection of pilot ignition. Trial ignition over a limited period of time is provided. Main and pilot oscillators each having only two transistors are employed to actuate respective main and pilot valves. Each oscillator is of a new type requiring few electronic components.

Abstract: An electronically commutated d.c. motor having a dome-shaped external rotor and a stator of a double-T-shaped configuration. Stator includes one yoke stack disposed asymmetrically in relation to the longitudinal stator axis. In addition, the stator includes two pole stacks each of which is provided on the same side with an extension in the circumferential direction. A printed circuit board is secured to a mounting flange of the d.c. motor.

Abstract: A device providing summarized information from the digital spectrum analyzer output within a Doppler radar. Four memories, each of 256 word capacity, are included. Each of said memories is addressed by a group of eight bits among the sixteen bits provided by the spectrum analyzer and a logic circuit reconstitutes an elementary summary plot from the contents of said four memories. For a sixteen-line spectrum analyzer it is thus possible to replace a read-only memory for 64K, seven-bit words by the aforementioned four such read-only memories each of 256, seven-bit words.

Abstract: A solenoid having one or more windings, a plurality of alternate windings of which are connected in electromagnetic field bucking relationship. An alternative construction utilizes layers of bifilar windings. A first winding of each bifilar winding pair in a first layer is adapted to procduce a field to buck the field of a second winding in the same bifilar winding pair.

Abstract: A feed for ticket printers including a magazine having a frame, driven rollers to deliver the bottom one of a stack of tickets to a selection station, the selection station effectively permitting the withdrawal of the bottom ticket while restraining the remaining tickets, and a pair of compression rollers to pull the bottom ticket further through the selection station.

Abstract: A flapper-poppet (new) that differs from a flapper-nozzle (old) in that the flapper-nozzle is a second stage operator that employs an amplifier which operates on de-amplified pressure. Although both the flapper-poppet and the flapper-nozzle are controlled by a conventional torque motor, the flapper-poppet is a first stage operator which operates on high supply pressure.

Abstract: A system for monitoring the level of an RF signal having such a small amplitude that it must be amplified before it can be monitored. To determine the deviation of the amplifier gain from the desired value, an additional RF signal of relatively high amplitude is used and is attenuated by a predetermined amount before being applied to the amplifier. The levels of the attenuated and subsequently amplified RF signal are compared with the level of the unchanged signal. From the deviation of this ratio, the gain variation is determined.Alternatively, in lieu of gain control of the amplifier the gain variation may be mathematically offset in the digital instrumentation provided.The monitoring system is suitable for use in the so-called instrument-landing system (ILS) and in VOR and DVOR en-route navigation systems.

Abstract: In the manufacture of display structures--including fluorescent material displays--by means of a print process, a base material (glass or plastic material), prior to the print process, is coated with an electrically conductive layer. During the print process, a strippable coating or pigmented lacquer having the shape of the structure, is deposited onto a first layer. After the print process, the non-printed electrically conductive layer is etched away and in the case of the non-fluorescent display structure, the strippable coating is peeled off the electrically conductive layer. The invention provides an improvement in the manufacture of display structures over the hitherto conventional photographic reproduction of silk-screen printing methods, and provides display structures having sharp edges to a thickness of approximately 10 .mu.m.