Abstract: An optical quality glass composition suitable for the production of optical elements with a refractive index gradient delta n of at least 100.times.10.sup.-4 by utilizing an ion exchange, consisting essentially of the following synthesis composition, in % by weight:______________________________________ SiO.sub.2 56-78 MgO 6-15 Li.sub.2 O 5-14 Na.sub.2 O 3-14 K.sub.2 O 0- 9 ______________________________________wherein the total of MgO plus Li.sub.2 O is 12-23.

Abstract: An installation for the height adjustment of the upper anchoring or deflection point for the shoulder belt of a belt system in a vehicle, with individual seats adjustable in the horizontal and/or vertical direction; a transmission installation is thereby interconnected between each seat and the coordinated anchoring or deflection point which during an adjustment of the seat so displaces the anchoring or deflection point that a height position of the anchoring or deflection point is achieved which is favorable for the belt user in relation to the adjusted seat position.

Abstract: An installation for the height adjustment of an upper deflection fitting for the shoulder belt of a belt system, which is accommodated in a hollow bearer of a vehicle, whereby the installation is steplessly displaceably guided in guidances of the hollow bearer while a hollow bearer wall is provided with at least one row of teeth or recesses into which engage the coordinated teeth or recesses of a detent member connected with the deflection fitting, against the effect of at least one spring force retaining the detent member in the normal position.

Abstract: A guide installation for a belt-band adapted to be wound-on and wound-off a magazine roll of a safety belt system which is arranged within the area of an after-connected deflection fitting; the guide installation is claw-shaped and thereby surrounds the deflection web of the deflection fitting with a spacing for passage of the belt-band over a portion of the circumference of the deflection web, whereby the spacing is smaller than twice the thickness of the belt band; at least the inlet portion of the guide installation pointing in the direction toward the magazine roll also includes a section that extends essentially parallel to the extension direction of the associated belt-band.

Abstract: A mechanism accommodated in a hollow bearer of a vehicle for adjusting the height of an upper deflection fitting for the shoulder belt of a belt system, which includes a slide member steplessly displaceable in guidances of the vehicle hollow bearer; one hollow bearer wall is thereby provided with at least one row of teeth or recesses into which the coordinated teeth of a detent member connected with a deflecton fitting and guided in a recess of the slide member, engage against the action of at least one spring force retaining the detent member in its normal position during those occurring tensional belt forces which exceed the tensional forces acting on the belt by the belt user during normal driving operation; a gliding member is thereby arranged in the slide member so as to be displaceable in height, whereby the gliding member cooperates with the detent member and displaces the same up to its engagement at least approximately transversely to its direction of movement during correspondingly occurring tension

Abstract: An upper fitting of a shoulder belt which is arranged displaceable in height within a body hollow space; the outlet opening for the belt band out of the hollow space is covered off by a shield which in its turn is provided with an aperture for the belt band, whereby the position of the aperture is adapted to be matched to the height adjustment of the fitting.

Abstract: The invention provides a process for producing a transparent optical-glass body having a linear index of refraction gradient. Particles of optical glass which contain leachble ingredients are pressed to form a self-supporting porous optical glass body. Some of the leachable ingredient is leached from a part of the porous glass, and a different amount is leached from a second part of the porous glass, the index of refraction varying in proportion to the different amounts leached from the glass body. The porous optical glass body is heated to eliminate the pores. Various means for effecting the different amounts of leaching over the length of the glass body are shown.

Abstract: An extremely high speed wide angle objective lens system, wherein a reducing Newtonian finder telescope is arranged in front of an objective lens group which produces a real image on an image plane. Rules or conditions are stated, and several specific examples are given. In many of the examples, the back focus distance is relatively large, thus making the lens system suitable for use with a mirror reflex camera where room is needed for swinging the reflex mirror.

Abstract: A neodymium-doped phosphate laser glass composition having a low threshold for stimulated emission, a negative temperature coefficient of refractive index, high acid resistence and homogeneity even in large structures comprises P.sub.2 O.sub.5, Na.sub.2 O or K.sub.2 O, Al.sub.2 O.sub.3, Nd.sub.2 O.sub.3, and optionally, F or RO, wherein R is Mg, Ba, Ca, Sr or Zn.

Abstract: A compact, self-supporting solid article of manufacture consisting essentially high temperature and wear-resistant antifriction material of low thermal expansion in the form of a heterogeneous sintered article of a matrix of glass or glass ceramic of low thermal expansion and distributed within the matrix small particles of at least one temperature and wear-resistant antifriction oxide selected from the group consisting of nickel oxide, cobalt oxide, ferric oxide, bismuth oxide and chromic oxide.