Abstract: A parallel optical scanning device, of the type comprising two prisms of small apex angle which rotate in opposite directions at the same speed about a common axis, wherein each of the prisms is composed of two coaxial parts secured to each other and arranged to produce different beam deviations.

Abstract: A device for guiding by night self-propelled missiles, comprising a daylight sighting telescope and an infrared goniometer which in association are called here daylight localizing apparatus, for spotting an infrared source carried by the missile, and a thermal telescope for night vision, to which are associated an infrared detector and a display member, further comprising a thermal reticle, optical means for forming outside the daylight localizing apparatus the image of the daylight telescope reticle, means for shifting the daylight telescope reticle image so that it coincides with the thermal reticle, optical means for forming the thermal reticle image on the thermal telescope detector, and an adequate frame mechanically attached to the daylight localizing apparatus for supporting said means, said thermal reticle, the thermal telescope and its associated detector and display member.