Abstract: A crosslinked polyolefin insulated power cable with remarkably improved AC breakdown voltage and impulse withstand voltage has been obtained by a process which comprises extrustion-coating, on the outer surface of a conductor, (1) a material for the formation of an inner semiconductive layer, comprising a base polymer and N-vinylcarbazole, (2) a crosslinkable polyolefin material for the formation of a crosslinked polyolefin insulating layer and (3) a material for the formation of an outer semiconductive layer in this order and then subjecting the coated conductor to a crosslinking treatment to form, on the outer surface of the conductor, an inner semiconductive layer, a crosslinked polyolefin insulating layer and an outer semiconductive layer in this order.

Abstract: An automatic inspection system detects foreign materials included in a sheet of transparent or translucent resin material such as a polyethylene compound. The automatic inspection system comprises an extruder for extruding a resin material into a sheet, means for withdrawing the extruded sheet along a path of travel, means disposed between the extruder and the withdrawing means for permitting the sheet to having down by gravity into a U-shape, sensor means for detecting a vertical position of the U-shaped portion of the sheet, controller means for adjusting the speed of sheet withdrawal for the withdrawing means in response to the output signal from the sensor means, a source of light disposed on one side of the path of travel of the sheet, an image sensor camera disposed on the other side of the path of travel of the sheet in confronting relation to the source of light for receiving light emitted from the source of light and having passed through the sheet to detect foreign materials included in the sheet.

Abstract: There is disclosed a solid ultrasonic delay line comprising a solid ultrasonic delay medium on which polygonal multiple-reflective surfaces are formed. An input transducer for radiating longitudinal waves is disposed on one of the reflective surfaces. The longitudinal waves are transformed into transverse waves by other one of the reflective surfaces and then reconverted by yet other one of the reflective surfaces into longitudinal waves which enter an output transducer disposed on still other one of the reflective surfaces. Ultrasound absorbers cover at least portions of the main boundary surfaces perpendicular to the reflective surfaces. Spurious waves of the longitudinal waves radiated from the input transducer are transformed by the main boundary surfaces into transverse waves which enter the absorbers.

Abstract: There are disclosed an optical fiber junction device and a method of making the same. The method comprises the steps of providing a central inner pipe or rod of glass, arranging a plurality of optical fibers around the inner pipe or rod, and externally heating the optical fibers and the central inner pipe to form a thermally fused assembly having cores of a sectorial cross section. The inner pipe may include a tapered portion having a reduced diameter. The optical fibers may comprise optical fiber junction units each composed of a plurality of optical fibers.

Abstract: There is disclosed a method for controlling an extrusion line for foamed insulation cables. In this method, a foaming insulation compound composed of a polyolefin resin and a foaming agent is supplied to an extruder, and extruded and coated as a foamed insulation onto a continuously fed cable conductor at a temperature higher than a decomposition temperature of the foaming agent to produce a cable that is subsequently passed through a cooler unit for controlling the outside diameter and electrostatic capacity of the foamed insulation.

Abstract: A heat-resistant synthetic resin composition, which comprises (A) 15 to 60% by weight of a film-forming synthetic resin soluble in a phenolic solvent and (B) 85 to 40% by weight of a phenolic solvent, said film-forming synthetic resin containing at least 30% by weight of a polyamide imide type resin obtained by causing (a) a tricarboxylic acid and/or an anhydride thereof containing citric acid and (b) a diisocyanate and/or a derivative obtained by masking diisocyanate with a phenolic compound in amounts of substantially equal moles to react in the phenolic solvent.

Abstract: There is disclosed a method of controlling the level of a self-levelling device comprising a table to be controlled in level, an air spring supporting the table, a sensor for contactless detection of an amount of displacement of the table from a reference position, an inlet valve for supplying air under pressure to the air spring through an inlet port therein, and an outlet valve for discharging air from the air spring through an outlet port therein. An interval of time for actuating the inlet valve and/or the outlet valve to return the table to the reference position is computed from the amount by which the table is displaced. The inlet and/or outlet valve is then actuated for the calculated interval of time to adjust the table level through the air spring.

Abstract: A liquid level detecting device, which has a low transmission loss and may be miniaturized, comprising a plurality of optical fibers each composed of a core made of a transparent material and a cladding layer covering the core therewith and made of another transparent material having a lower refractive index than that of the former transparent material forming the core, end portions of the optical fibers being placed in adjacent to each other in either parallel arrangement or that attained by making an acute angle with each other, and a detecting portion which is obtained by heating the adjacent end portions of these optical fibers to fuse one another and shaping into a spherical form due to the surface tension of the fused material.

Abstract: There is disclosed a solid ultrasonic delay line which comprises a delay medium having two parallel major faces and at least three end faces intersecting the major faces, an input transducer bonded to one of the end faces and polarized in a direction parallel to the major faces for transmitting an ultrasonic signal in a shear mode into the delay medium, and an output transducer bonded to one of the end faces for converting the ultrasonic signal having propagated through the delay medium into an electrical signal. The input and output transducers have boundary surfaces lying flush with the two major faces of the delay medium, the major faces and the boundary surfaces being ground to a surface roughness which is one-twentieth or smaller of the wavelength of the ultrasonic signal propagating through the delay medium.

Abstract: Disclosed is a method of controlling an enamelling oven, in which a plurality of controlled variables such as temperatures:Y=(Y1 . . . Yl)including a plurality of measured variables:(Y1 . . . Ym)are variable by any one of a plurality of manipulation variables such as the degrees of opening of dampers:U=(U1 . . . Um)where l and m are positive integers equal to or greater than 2 with m>l. The method comprises the step of controlling the controlled variables to reach reference values therefor:YR=(YR1 . . . YRl)by effecting integrating action on each of variable factors:U'c=(Uc1 . . . UcM)which are derived from the differences between the controlled variables and the reference values:Y-YR=(Y1-YR1 . . . Y-YRl)=(.epsilon.1 . . . .epsilon.l)to produce outputsUc=(Uc . . . UcM)which serve as the controlled variables, respectively.

Abstract: A polyborosiloxane composition to be used for the formation of an insulating layer on an electric conductor comprises (A) a polyborosiloxane produced by the reaction of boric acid, a boric acid derivative, or a halogenated boron with a silane compound and a silicone oil, (B) a silicone resin or a synthetic resin having a nitrogen-containing heterocyclic ring in the molecule, (C) an inorganic filler, and (D) a common solvent for (A) and (B). An insulated electric wire excellent in thermal resistance is obtained by applying the composition to an electric conductor and baking the applied layer of the composition.

Abstract: A temperature-sensitive fuse comprises a first electric conductor electrically connected to one end of an electrically conductive casing; a second electric conductor which is connected to the other end of the casing in such a manner so as to be electrically insulated therefrom; a temperature-sensitive, fusible pellet disposed in the end portion of the casing containing the first conductor; a movable disc member which is disposed between the fusible pellet and the top portion of the second conductor, normally in contact with the top portion of the second conductor and the inner wall of the casing, and held by a spring in such a manner that when the fusible pellet melts and collapses at a predetermined ambient temperature, the movable disc is moved away from the top portion of the second conductor.

Abstract: Disclosed is an interleaved multiple signal separating circuit in which a luminance signal and a chrominance signal are separated by a circuit for adding a composite video input signal including the luminance signal and chrominance signal which is delayed by a predetermined period of time by an ultrasonic solid delay line to the composite video input signal and by a circuit for subtrating the delayed composite video input signal from the composite video input signal. The separating circuit comprises a series circuit of an input transducer of the ultrasonic solid delay line and a voltage division load connected to the input transducer. The input signal is applied to the series circuit. A delay output signal from the output transducer of the ultrasonic solid delay line and a signal across the voltage division load are combined to provide a sum signal and a difference signal thereof.

Abstract: The present invention relates to a laminated insulating paper formed of cellulose paper or papers which is adhered to at least one side of cross-linked silicone grafted polyolefine film and to an oil-filled (OF) cable which insulated by the laminated insulating paper. The laminated insulating paper has outstanding peel strength as well as excellent non-solubility and anti-swelling properties in insulating oils.

Abstract: A wire stock is continuously deformed into a coil and the coil is temporarily stored in a storing device as a bundle. The bottom of the storing device is periodically closed and opened for discharging the bundle into a receptor and for piling up the bundles one upon the other. By the impact force of a falling bundle, already accumulated bundles are compacted.

Abstract: The splicer comprises a stationary block provided with a first V shaped groove for accommodating opposing ends of optical fibers, and an opening perpendicular to the groove. On the opposite sides of the stationary block there are provided a pair of slidable blocks provided with second grooves in alignment with the first groove and clamping means for clamping the fibers. The slidable blocks are moved toward and away from the stationary block by micrometers. A heater is provided in the opening for heating and fusing together the opposing ends of the optical fibers.

Abstract: A cooling tube for cooling a hot rolled wire stock by cooling liquid is divided into a plurality of cooling sections by spaced apart partition members. Each partition member comprises a nozzle like rotary member having an axial passage for passing the wire stock. The inlet opening of the passage is circular having a diameter slightly larger than the major axis of the maximum oval cross-sectional configuration which is formed for the hot rolled wire stock when its size is changed, while the outlet opening is an oval having a major axis equal to the diameter of the inlet opening and a minor axis slightly larger than the diameter of the circular portion of the wire stock having the maximum diameter. The cross-sectional configuration of the passage gradually changes from the inlet opening to the outlet opening to prevent leakage of the cooling liquid.

Abstract: A d.c. high tension cable termination or joint and method of manufacturing same is described. The cable comprises an electric conductor, an electrically insulating layer which is concentrically applied over the conductor, and a semi-conductive layer which is concentrically applied over the insulating layer in close contact therewith. The cable termination or joint comprises an electrically insulating liquid impregnated into a portion of the semi-conductive layer which is located adjacent to an end of the insulating layer so as to present an electrical resistance which is higher than that of the non-impregnated portion of the semi-conductive layer but is lower than that of the insulating layer. The electric conductor is electrically connected with the end of that portion of the semi-conductive layer impregnated with the insulating liquid which is located nearer the conductor.

Abstract: In an electric cable power transmission line of the class wherein three phase metal sheath single core power cable sections are interconnected by junction boxes, two sets of ordinary junction boxes at the opposite ends of each unit line section are grounded, two sets of junction boxes are provided in each unit line section, at each set of the insulating junction boxes the sheaths of the cables of one phase on one side of the insulating junction boxes are crossconnected by cross-connecting wires to the sheaths of the cables of another phase on the other side thereby forming three loop circuits each including the grounding connections of the ordinary junction boxes, the sheaths of the cable sections and the cross-connecting wires, saturable reactors are connected in series with only one or two of the loop circuits. This arrangement reduces the number of the saturable reactors and protective devices for corrosion preventing layers as well as the inductive interference to nearby communication lines.