Apparatus for locating a short circuit in the wiring of a DC circuit having current-intermitting means connected in parallel with a power supply fuse of the circuit for intermittently conducting a current from a power source of the circuit to the wiring when the fuse is blown. A searching unit includes a search coil for detecting an alternating field formed around a portion of the wiring through which the intermitting current flows. The current-intermitting means includes a voltage detector for ...

A perforated electrode for an electrofilter for gases which includes a sandwich-like arrangement of at least one electrically conductive support layer and a thinner spray discharge layer. The spray discharge layer is formed from a material which has a higher resistance to burning due to spray-discharge than the material of the support layer.

A master-slave type J-K flip-flop circuit comprising a master flip-flop circuit-producing outputs Qm, Qm and a slave flip-flop circuit-producing outputs Qs, Qs. The master flip-flop The master flip-flop circuit includes a first set input circuit having a current-switching type logical circuit which performs an AND operation of an input J and clock Cp in reference to the output Qs and a first reset input circuit having a current-switching type logical circuit which performs and AND operation of a...

A method for manufacturing a block bag of thermoplastic material with at least one filling valve from a tubular foil part having bottom flaps and at least one corner flap forming the valve being longer than the bottom flaps, wherein the bottom flaps are folded around a heat isolating piece and the stack of foils forming the bottom are heatsealed together by applying heat from both sides of the stack. The seals are obtained by spot welding, or formed as labyrinth seals. The end of the corner flap...

A machine for soldering water boxes on the collectors of heat exchangers including a circular rotatable table fitted with mountings for the water boxes and the heat exchangers. The machine includes means to press each water box on its associated heat exchanger, and a fixedly mounted infrared row located above the rotatable table on a portion of its periphery.

A tablet of chlorine releasing solid compound having substantially parallel plane faces in which the surfaces of the edge between the faces is sealed by water impervious and water insoluble material, which may be a continuous band of insoluble material which adheres to the compound, may be a band comprising a flexible sheet material attached to the edges of the tablet by a water insoluble adhesive, at least one of which is water impervious, or may have one of a number of alternative construction...

A wall rail for fixation of wall panels and interior fittings such as shelves, pendant cupboards, etc. has two essentially parallel shanks situated close together with a flanged section roughly at right angles thereto and projecting only to one side, having fixing holes for attachment of the wall rail to an underlying wall there being arranged between the parallel shanks bracket-carriers at regular short intervals and element-carriers at regular long intervals, the longer interval constituting a...

An optical sound track is formed in multiturn spiral arrangement on one surface of an opaque sheet-like medium. On the opposite surface some information relating to the sound intelligence recorded on the other surface may be visually represented. For reproduction, the record sheet is placed on an optical sound reproducer with its sound track in face-to-face registered relationship with a turntable on the top surface of the reproducer. A photoelectric reproducing head positioned below a radial sl...

A method of producing a hollow cylindrical body of revolution in which there is welded to the outer peripheral surface of a metal sleeve a lower molten metal by means of a ring of molten metal surrounding the sleeve and the sleeve and ring of molten metal being relatively vertically displaceable. Other external layers can be applied successfully by the same method.

Metallic fibers, made for example of stainless steel, are arranged substantially circumferentially of a yarn so as to enclose nonmetallic fibers, such as various synthetic or natural fibers. Each of the metallic fibers has a polygonal cross section, such that the relatively sharp-edged corners of these metallic fibers extend throughout the length of the yarn. The electrostatic charges that have built up on any part of the yarn are efficiently collected by the sharp-edged corners of the metallic ...