Abstract: A method for optically aigning a machine part which should have its center line perpendicular to the vertical plane of a reference. The deviation in the horizontal and in the vertical plane between the actual position and the desired position of the part is numerically determined through the use of a theodolite. For determining the deviation in the horizontal plane two reference marks are provided entirely outside the machine at a distance as far as possible from each other. The distance between the two reference marks determines both a base line running parallel to the longitudinal center line of the machine and the position of the vertical plane of reference.

Abstract: Non-woven glass-fiber webs for reinforcing plastics material carrying printed circuits are produced by the wet process from E-glass fibers bonded with polyvinyl alcohol. The polyvinyl alcohol used is a powder or suspension, has a degree of hydrolization of 98 - 100%, and a viscosity, as a 4% solution in water of 20.degree.C, of 20-100 cP. Preferably the polyvinyl alcohol has a degree of swelling at 20.degree.C of between 3 and 8, and in the dry form a particle size of between 50 and 180 .mu.. A plurality of these glass fiber webs are impregnated with a solution of an epoxy resin, arranged as a laminate, then compressed at elevated pressure and temperature to form the final laminate.

Abstract: Non-woven glass-fiber webs for reinforcing plastics material carrying printed circuits are produced by the wet process from E-glass fibers bonded with polyvinyl alcohol. The polyvinyl alcohol used is a powder or suspension, has a degree of hydrolization of 98-100%, and a viscosity, as a 4% solution in water of 20.degree. C., of 20-100 cP. Preferably the polyvinyl alcohol has a degree of swelling at 20.degree. C. of between 3 and 8, and in the dry form a particle size of between 50 and 180.mu.. A plurality of these glass fiber webs are impregnated with a solution of an epoxy resin, arranged as a laminate, then compressed at elevated pressure and temperature to form the final laminate.