A heading sensor includes a housing containing an interferometer having a mirror movable in response to fluctuations in a gravitational force applied to the housing. The interferometer, responsive to a light beam, generates an optical signal modulated according to the relative displacement of the mirror. The housing further includes an electromagnetic coil positioned along an axis of the housing for generating a current signal indicative of fluctuations in a magnetic field applied to the housing...

A heading card with an azimuth scale on the face thereof is mounted on a cage rotatable about the axis of the card. The cage is responsive to the output of a directional gyro for controlling the orientation of the heading card. An omnilocalizer-bearing selector and a bearing deviation indicator are mounted within the cage for the selection of a navigation bearing. A glide slope indicator is responsive to reception of a selected localizer frequency for moving into view over the face of the headin...

A curtain heading tape in which lateral stiffness is provided by using, as a weft in the body of the fabric, a composite yarn consisting of a core of relatively stiff synthetic yarn around which is wrapped at least one other yarn, whereby the composite yarn so formed has a surface characteristic such that any tendency of warp yarns to slip relative to the weft yarns when the fabric is woven is prevented or substantially reduced due to the uneven surface of the composite yarn.

A curtain heading tape having a body and spaced pockets on at least one face thereof, wherein there is at least one draw cord in the tape, the draw cord passing through the body adjacent the edges of the pockets and also passing through the body between the edges of the pockets, thereby forming a reverse bulge immediately behind the pocket for the reception of a curtain hanging device.

A curtain heading tape for use with draw curtains or the like, the tape having pockets on one face and at least three draw cords in the tape. The pockets are spaced in rows at different transverse distances from the edges of the tape, whereby the tape can be attached to a curtain at different specific heights of the curtain above the level of the suspension hooks.

A punch for forming a fastener head has a shaped projection at each end and is releasably secured in a holder with one end abutting against a ledge on the inside of the holder and the other end extending beyond the holder. The shaped projections are formed simultaneously by a pair of hobs in one press stroke.

An odograph in which calibrated portions of heading and distance signals are used for displaying locations. A magnetic compass is provided including a North-seeking spherical surface carrying a reflective segment, the position of which is sensed by electro-optical components which derive and generate an appropriate heading signal. An odometer generates distance signals which are integrated with the heading signals, calibrated by gating with a probabilistic function. A visual display is driven by...

This invention employs a magnetometer as a magnetic heading reference for a vehicle such as a small aircraft. The magnetometer is mounted on a directional dial in the aircraft in the vicinity of the pilot such that it is free to turn with the dial about the yaw axis of the aircraft. The invention includes a circuit for generating a signal proportional to the northerly turning error produced in the magnetometer due to the vertical component of the earth's magnetic field. This generated signal is ...

A magnetic compass disc acts as a source of polarized light whose direction of polarization aligns with the prevailing external magnetic field. The polarized light falls on an analyzing disc having central and outer polarized regions whose respective directions of polarization are at an angle to each other. A pair of photo-responsive elements are disposed to respectively receive polarized light passing respectively through the central region of the analyzing disc and through the outer region of ...

In order to determine the azimuthal deviation between a reference direction and a heading indication given by an instrument aboard an aircraft, particularly for resetting that instrument before takeoff, a ground installation at an airport includes a radiation source emitting an outgoing laser beam which is periodically deflected by a land-based polygonal drum to sweep between predetermined boundaries in a horizontal plane. As the aircraft taxies across the deflection path of the laser beam, a mi...