Abstract: An arrangement for fluid jet insertion of weft threads into the shed of a weaving machine, which arrangement is formed from a main duct having a fluid conveying duct and a transporting duct with their axes forming an obtuse angle with one another, and a thread conveying duct which opens into the main duct with its axis in substantial alignment with the axis of the transporting duct, and the main duct having a narrowed cross-section in the region where the thread conveying duct enters into it.

Abstract: A two-dimensional light deflector is shown which comprises a cylindrical member having a plurality of holograms recorded thereon. A collimated light beam is directed to illuminate the hologram cylinder and rotation of the hologram cylinder provides a line scan which is at an angle of about 45.degree. with respect to the plane of rotation of the cylinder. The azimuthal position of the line scan can be varied by the rotation of a small mirror which directs the illumination beam. As a consequence, a two-dimensional raster scan on a cylindrical image surface is produced.

Abstract: An omnidirectional scanning apparatus which generates a multiple cross scanning pattern is described. The scanning apparatus comprises a flat ring-shaped hologram. The hologram disk is rotated about its axis as a small area is illuminated by a collimated light source, such as a laser, to produce a series of reconstructed beams which scan segments of a circle. Optical means is provided to intercept the reconstructed beams and reflect them to a scanning window where the segments produce a multiple cross scanning pattern. In a specific embodiment the holograms recorded are reconstructed as segments of concentric circles and the optical means comprises a stationary mirror for each direction of scan across the scanning window.