A controlled absorption path filter for charge couple device seekers is made using a variable depth fluid. The use of a liquid as an absorber permits the entire aperture area to darken without loss of aperture. Thus the device provides a uniform extinction feature which preserves the system modulation transfer function. The device can be tied to a closed loop system with automatic gain control for feedback. Depending on the nature of absorber in the liquid, the device can also serve as a spectra...

A rolling diaphragm seal is inserted between a pair of telescopic tubes containing a laser beam and a reflective mirror to preclude ambient air or lubricant from impinging on the mirror or for changing the density of the air within the tube to cause a change in intensity of the laser beam. The telescoping tube pairs can be used as part of a control system for the positioning of the beds of an ultra-precise machining apparatus such as found in turning and grinding machines for generating flat, sp...

A flow path block having capability for storing a plurality of reactant volumes and for delivering the reactants through separate paths to a common mixing chamber where the reactants are mixed and delivered through reactant outlet means. Reactant outlet means may include a measurement chamber for determining the stopped flow kinetics of reactions in the mixture or may be a path for delivery of the mixed reactants to an external vessel for some subsequent intended use.

This specification discloses applique circuitry for an incoming trunk circuit. The circuitry detects those faults and "black box" devices on telephone call connections which produce undesired momentary off-hook signals for tripping incoming call ringing and allowing call conversation, but which are inadequate for generating called party answer signals needed for charging purposes. Relays in the circuitry are activated by the trunk circuit for producing a timed test answer signal following the tr...

Multiple path means for a fluid flow control device is shown in connection with a typical spool type servo valve. The multiple path means consists of a stack of washer-like elements or disks which cooperate to define a large number of finely divided flow paths across a stack of disks. To provide a configuration which is very economical of space, the disks are arranged such that the flow path turns back and forth through different planes. Groups of flow paths are defined by a number of groups of ...

Selectable flight path angle guidance of the accelerating or decelerating flight of a VTOL aircraft such as a helicopter in take off or landing maneuvers is provided by cooperative use of a novel flight director system and the thrust and pitch attitude controls of the aircraft, thrust control being employed to maintain a selected flight path angle, while pitch attitude is used to control acceleration or deceleration of the craft to a constant speed which is a function of the selected flight path...

A flight slope calculator having relatively movable distance and altitude scales arranged to facilitate the vertical navigation of aircraft and in particular to permit a pilot to ascertain the point at which he should start his descent during the approach to an airfield.

A switching network for multistage switching systems using IC techniques is proposed in which each switching matrix is self-sufficient, i.e. operates independently during both path finding and marking. This is accomplished by a selection circuit inside each switching matrix which circuit can be easily combined with the other logic elements for passing on offering and catching signals to form an integrated circuit.

The invention includes a delivery conveyor to receive freshly baked products from baking pans of an automatic baking oven. The baking pans containing freshly baked products follow an arculate path at the discharge end of the oven for releasing freshly baked goods. The delivery conveyor positions at the discharge end of the oven and follows a curved path which is parallel to and closely spaced from the baking pans to prevent the newly baked goods from falling through a distance that is sufficient...

A network path test circuit for testing call connections established through the switch network of a telephone toll switching office. Common control equipment of the telephone toll switching office momentarily applies a tone signal to the transmit and receive paths of a call connection prior to outpulsing a called telephone station directory number. Detector apparatus measures the impedance reflected back over the call connection to determine the absence and existence of path transpositions in t...