Abstract: A plurality of like, thermoformable plastic laminate articles and a method of making same in which a substantially flexible plastic sheet is bonded to a substantially rigid thermoformable plastic core. The sheet has markings disposed on one face thereof, and the markings are disposed at the same predetermined location with respect to the core for all of the plurality of articles.

Abstract: A rotary assembly for rotating a vessel such as a rotary kiln with a minimum amount of heat transfer to the driving element. A pluraltiy of coupling assemblies are provided which include a first bracket attached to the vessel. Pivotally connected to the bracket is a link member having an opposite pivot point on the driving element. With the coupling arrangement, heat from the inner rotating element which causes different rates of thermal expansion with respect to the girth gear does not produce high stresses on either element.

Abstract: A machine tool for scribing arcs and circles on work pieces comprising an elongated arm having a vertical stud adjacent one end for mounting in a chuck on a rotary spindle, a slide having a plurality of scribing styluses of different sizes disposed at an angle to each other and extending perpendicularly from the outer surface, the slide being movable along the arm to dispose the styluses selectively at desired precise distances from the stud and the slide also being rotatable on the arm to position one of the styluses in parallelism with the stud, a clamping thumb screw threaded into the slide for engagement with the arm to releasably secure the slide to arm at a selected position thereon, slide having a notch extending into the face nearest stud and adapted to receive the same when very small radii are desired, and a fixed reference flange on the stud end of arm positioned outwardly from the axis of stud a distance equal to the distance between the axis of the stylus on slide and the face of the slide neares

Abstract: A uni-directional viewing system with an obliquely disposed mirror defining a beam splitter for partial reflection and partial transmission of a light beam that is generated by a source and having an absorber disposed at one side of the mirror for absorbing the beam that is transmitted through the mirror. The reflected beam is directed towards a viewing port, which is disposed at the other side of the mirror. An eye port, which is disposed on the absorber side of the mirror, is provided for observing a subject at the viewing port. The observed subject views only the image of the source and the observer views the observed subject.