A common path interferometer is provided using one or more roof mirrors for effecting an optical path delay required to generate an interferogram of a target signature. The optical arrangement using the roof mirror separates the beam of radiation transmitted from the target to produce a fixed delay between the separated beams and, by rotating the roof mirror, a variable delay between the beams is obtained without leaving the target, thus generating an interferogram between the two interfering be...

Disclosed is a glide path lighting system which is provided with a lens, a light source, and a screen whether or not constructed as a color filter disposed in the focal plane of the lens between the lens and the light source. The lens is provided with a diaphragm having an opening which is wider in the horizontal direction than in the vertical direction.

Path test apparatus and a method for verifying the continuity of a data path in a telephone system between an input portion and an output portion of a telephone interface which receives and transmits telephone signals where the telephone system operates in time frames each consisting of a plurality of time slots. The apparatus includes a signal generator which connects a test signal to a selected time slot in said input portion. Means are provided for connecting a data path between a time slot i...

A time division switching system having distributed control processors is disclosed. The switching system includes time-slot interchange units having associated subscriber sets and conference circuits and a time-shared space division network for interconnecting the time-slot interchange units. Each of the time-slot interchange units and the time-shared space division network are controlled by separate control processors. In response to called subscriber set identifying information from a calling...

An articulated manipulator and control are provided for producing controlled motion of a function element carried by the manipulator. The motion is defined by input signals specifying with respect to a rectangular coordinate system the positions and path velocities therebetween of a tool centerpoint associated with the function element. The control interpolates intermediate points along a predetermined path between any two positions. The intermediate points are produced in accordance with a fixe...

A multi-path interrupter device (e.g. joystick) includes a housing 10 constituted by two parts (11, 12), a plurality of interrupters 16 distributed along a circle and a control member 20. The control member is formed of a single piece of resilient material and has a lever pin 21 held on a pivot 25 carried by the housing. The control member 20 includes a peripheral crown 23 arranged to act on the interrupters 16. The member 20 also includes resilient return means for biasing the member to a centr...

In an actuator having a stator assembly which defines a pair of stator pole faces, a permeable rotor assembly which is positioned to rotate relative to the stator assembly, and which defines a driving pole face separated from each of the stator pole faces by a flux permeable driving gap, the rotor assembly having an operational range of rotor angular positions over which drive flux passing across the driving gap drives the rotor assembly, the extent of the driving gap at one of the stator pole f...

In a time division switching system of the time-space-time (T-S-T) arrangement, a speech path memory having both forward and backward time switches has addresses corresponding to accommodated lines; and a speech signal and a non-speech signal (a signal indicating an on-hook or off-hook state and other control signals) are transmitted over a highway between each line module and a switch module. When a speech channel is busy, the speech signal is read out from a speech path memory and written ther...

A circuitous path flow restrictor (10) having no moving parts includes a fluid director member (16) having a core (24) and a plurality of fins (26) extending from the core and defining alternately axially offset notches (50,52). The fluid director member is encircled by a containment member (54) such that a serpentine fluid flow path (58) is defined therebetween to provide a fluid flow resistance level equivalent to a simple orifice of much smaller diameter. The fluid director member can be made...

A glide path instrument for an aircraft to display to a pilot that the aircraft is descending on a predetermined inclined glide path. The instrument includes a rectangular casing mountable in stationary position in the aircraft and carrying a freely pivotable frame which has sighting elements at opposite ends spaced different vertical distances from the plane of the frame. The frame carries a pendulum-like structure including depending legs supporting free swinging weights. The sighting elements...