Abstract: A heat exchange apparatus is disclosed comprising a heat transfer conduit wherein a heat transfer fluid flows in a corrugated sealed evacuated tube between hot and cold zones with the fluid being evaporated in the hot zone and condensed in the cold zone, said tube being wound to provide a plurality of windings, with a first portion of each winding being in the hot zone and a second portion of each winding being in the cold zone. The heat transfer conduit so wound is axially positioned within a tubular container comprised of a metal of high heat transfer conductivity and having a polygonal cross section. Each first portion of such windings is attached to an interior surface of the tubular container by means of a connector member also of a metal of high heat transfer conductivity, thus providing an efficient heat conductance path from the outside surface of the tubular container to the inside surface of the plurality of windings in the hot zone.

Abstract: A method of fabricating a plurality of heat transfer conduits is disclosed wherein an elongated metal pipe is evacuated, a predetermined quantity of heat transfer fluid is placed within such evacuated pipe and the pipe ends sealed airtight. The elongated sealed pipe is wound in a helical or serpentine configuration, the lower vertical portions of the so configured pipe are heated so that the liquid phase of the heat transfer fluid is evaporated and redistributed in an even manner in the lower vertical portions of successive convolutions of such pipe, and is then flattened, for example, at each of its upper vertical portions to form vacuum-tight seals between adjacent convolutions. A cutting procedure across each of the flattened upper portions (or selected ones of such flattened upper portions) enables a separation of the elongated sealed pipe into a plurality of heat transfer conduits without the necessity of a further evacuation procedure.

Abstract: A communications cable in which optical waveguides partially fill the inner cross section of a corrugated metallic tubular member and form therein an undulatory configuration extending in the axial direction; thus providing for any given section of cable a length associated with the optical wavesguides that is greater than the length of the corresponding section of the tubular member of such section of communications cable.

Abstract: Production of extruded products wherein a polyolefin composition, a volatile, flammable liquid organic peroxide cross-linking agent and an antioxidant are introduced into the inlet of an extruder, with the antioxidant being a thio-bisphenol soluble in the peroxide having a melting point of less than 125.degree. C. of the general formula(R' C.sub.6 H.sub.2 --R" OH).sub.2 S.sub.xwherein x is a whole number equal to 1, 2 or 3. The preferred antioxidant is 2,2'-thio-bis(6-t-butyl-p-cresol).

Abstract: A corrugating ring for corrugating metal tubing having a helical corrugating rib which increases in height from the beginning thereof to a maximum height to increase corrugation depth, with the maximum height extending over at least 360.degree.. The corrugating rib has a curved corrugating surface, and the radius of curvature of the surface increases from the beginning of the rib to the maximum height thereof whereby corrugation width is increased with corrugation depth.

Abstract: A winding device comprised of parallel spaced supporting bodies on which an elongated flexible material is helically wound in a single layer. The bodies are interconnected by a folding mechanism, whereby the bodies can be axially displaced to reduce the distance therebetween and thereby reduce the length of one axis of the wound material while retaining the length of the other axis to permit transportation thereof in appropriately sized containers.

Abstract: A device for unwinding elongated material from a coil which includes a plate which is placed on top of the coil, with the plate including a rotatable guide means for guiding unwound material, and at least two elongated arcuate members which extend into the coil interior and define a cylindrically shaped shell. The arcuate members are pivotally mounted to the plate, and are provided with a means which exerts a force against the arcuate members to press the arcuate members against the coil interior to hold the interior windings as the coil is unwound.

Abstract: The tapered working roller of a skew rolling mill is provided with a deformation surface in the form of a paraboloid and a smoothing surface at the end of smaller cross-section in the form of a technical hyperboloid.

Abstract: A metal mold employed for the casting of metals, preferably steel, has a wear resistant layer on the casting surface thereof formed of a different metal having solid particles dispersed therein. A preferred mold is formed of copper or alloy thereof having an electrolytically deposited nickel layer with silicon carbide particles dispersed therein.

Abstract: A skew rolling mill is provided with a deforming smoothing means in contact with the stock immediately beyond the working rollers to remove markings. The deforming means is supported in a support which rotates about the axis of the stock.