Abstract: A synthetic test circuit for testing a metal-encapsulated high voltage circuit breaker of a type which is grounded on one side and which includes several switching gaps arranged in series. The testing circuit includes a high voltage source and a high current source for stressing the switching gaps during testing and, in addition, a high voltage means for applying a high voltage to the encapsulation simultaneously with the application thereto of a further voltage from the high voltage source. The high voltage is chosen to be of opposite polarity to the further voltage and the encapsulation is insulated from ground potential during application thereof.

Abstract: A control circuit for an a-c control element consisting of controlled rectifier elements in conjunction with a transformer in which a separate current transformer is provided for each of the transformer windings and all current transformers of the same respective phase have their secondaries connected together in a bucking circuit, to which a measuring arrangement is connected which measures the peak value of the difference value formed during each half-wave, and the output signal of which is introduced, depending on the polarity of the difference value, into the control circuit of the one or the other branch of the a-c control element.

Abstract: The supplied strand is provided with a permanent twist due to the rotating balloon and a superimposed false twist due to a false twist device prior to winding onto the bobbin package. Prior to winding on the package, the false twist is eliminated so that the resultant roving has relatively high breaking strength for handling purposes while remaining draftable.The false twist device is located between the delivery rolls and spindle to rotate coaxially around the spindle and may be driven by the balloon or by a positive drive.

Abstract: The invention relates to a sintered composite material as the contact material for medium-voltage vacuum power circuit breakers, particularly in the switching voltage range from 7.2 kV to 36 kV. The contact material is comprised of a sintered composite of a burn-off-resistant metal component such as iron, cobalt, chromium, nickel, zirconium or alloys or mixtures of these metals, and a component which lowers the breaking current. As the breaking current-lowering component are provided metals, compounds or alloys of metals having a boiling point above 2400.degree. C. such as, for example, tin, chromium carbide (Cr.sub.3 C.sub.2) or copper zirconide (ZrCu.sub.4, ZrCu.sub.3).

Abstract: The drive uses a recessed wall or partition between the pole-rings of the two rotors to substantially diminish the occurrence and strength of eddy currents. The recesses may be in the form of grooves, depressions or axial bores which reduce the mass of the wall. The wall is further reinforced by non-magnetic electrically non-conductive or insulated elements of high tensile strength to compensate for the reduction in strength caused by the grooves, depressions or bores.

Abstract: The head box guide is formed of a metal block with cylindrical bores into which a pair of telescoping plastic inserts are fitted. Each pair of inserts are formed so as to define a stepped widening within the block. In addition, the inserts have terminal parts which are disposed outside of the bores and which are locked together in contiguous fashion so as to avoid any gaps. Also, a honeycomb connecting member rests on the downstream terminal parts of the inserts to form continuations of the flow passages.

Abstract: Disclosed herein is a method for generating hydrogen through the electrolysis of water or aqueous solutions, wherein a cathode material is used which binds hydrogen to its surface in a potential range which is more positive than the reversible hydrogen potential, or which incorporates the hydrogen into its crystal lattice; subsequently, the bound hydrogen is liberated from the cathode material through supply of thermal energy.

Abstract: The apparatus is provided with a piston-and-cylinder unit which carries a flange for abutting under the bearing cap as well as a pre-loading press which is mounted on an arm which extends radially from the piston-and-cylinder unit. The arm is movable together with the piston-and-cylinder unit so as to be positioned below the bolts which secure the bearing cap in place. The arm has a guide device mounted at the end which permits axial and rotating movements of the pre-loading press and is surrounded by a spring by which the press is carried.

Abstract: A method for electrochemically determining the concentration of heavy metals in water by precipitating the metals at a solid electrode under the influence of a constant negative d-c voltage and subsequently dissolving them by anodic oxidation, in which the metals are precipitated at a platinum metal electrode; the water is then replaced by an electrolytic solution and the precipitated metals are dissolved again by suddenly changing the negative d-c voltage into a constant positive d-c voltage, while the electric charge required for the dissolution is determined and the concentration is determined therefrom; the time of application and the magnitude of the d-c voltage are always kept constant during the precipitation as well as during the dissolution of the metals.

Abstract: A one piece fusible conductor wherein a current carrying isthmus member in the form of a bridge connects first and second members. The first member has a hole in the vicinity of the isthmus and the hole is filled with a rivet shaped solder deposit and defines current carrying regions of the first member leading to the isthmus. In accordance with the invention, the horizontal profile E of the cross section of each of the latter regions is within a range of 0.7 to 1.00mm and the horizontal profile D of the cross section of the isthmus is within a range from 1.0 to 2.00mm. Furthermore, the profiles E and D satisfy approximately the following relationship: 0.75 .gtoreq. E/D .gtoreq. 0.5.

Abstract: The disclosed signalling apparatus provides a different identifying signal in response to a ringing signal for one or more telephone station sets connected by a common line to a centralized switching, control and signalling machine. The different identifying signals are generated in response to the number and timing of ringing signals applied to the line. If a first ring is sensed and within a predetermined first time a second ring is sensed, a first identifying signal is initiated. If a first ring is sensed and after the predetermined first time but before a predetermined second time a second ring is sensed, a second identifying signal is initiated. If a first ring is sensed, but a second ring is not sensed before the predetermined second time, the signalling apparatus is reset to initial conditions.

Abstract: The present disclosure is directed to material recovery apparatus comprising a rope of an adsorbent material arranged for floating on the surface of a liquid contaminated by a contaminating material preferentially adsorbed by the rope, the rope being in the form of a continuous loop extending between a desorption station through which the rope is advanced to remove adsorbed material and a floating rope guide structure at which the rope is guided around guide means. The rope guide structure is so constructed as automatically under the pull of the rope during relative movement between the desorption station and the liquid to bring the rope into a disposition in which a part at least of the length thereof has a component of motion over the surface of the liquid and relative thereto which is transverse to the longitudinal direction of the said part.

Abstract: The damping device has a transition section of increasing cross-sectional area with a perforated plate extending across the downstream end. The perforated plate has ducts which increase in cross-sectional area in a step-wise manner. The transition section may have a parabolic profile, a conical profile, an arcuate profile or may be formed of a sequence of conical parts.

Abstract: A papermaking machine having pulp supplied in a regulated excess amount through a feed channel onto a movable water-pervious element and having a sump positioned at the end of the feed channel to receive the overflow. The amount of pulp in the sump relative to the desired overflow rate is used to produce a control signal for regulating the machine. Should there be an excess amount of pulp in the sump over the desired amount, the negative pressure in the vacuum box is increased to withdraw more water. Also, the degree of grinding of the pulp can be varied in dependence on the control signal.

Abstract: A DC arc furnace has a cathodic tubular graphite electrode forming an arc with an anodic carbonaceous iron melt in the furnace. A mixture of iron oxide and carbon particles is fed to the melt via the electrode's interior with the mixture's carbon content being in excess of that stoichiometrically required to reduce the iron oxide content of the mixture, the upper end of the electrode's feeding passage being blocked so that furnace gases cannot flow upwardly and impede the mixture's downward feeding flow.

Abstract: A compressed gas circuit breaker is disclosed. The breaker comprises two fixed hollow contacts which are bridged by a tubular bridging contact member when the breaker is in the closed position. A blasting means provides compressed gas for quenching the arc when the bridging contact is moved to a position whereat it no longer bridges the fixed contacts. The blasting means includes a piston and a blasting cylinder which surrounds the piston. In accordance with the invention, the end portion of the blasting cylinder, which is moved from one fixed contact to the other fixed contact across the gap therebetween during the opening of the breaker is provided with an annular electrode. The latter electrode prevents a recurrence of the arc, without having to increase the gap between the contacts.

Abstract: The flat hollow section member is provided with one or more apertures in at least one of two oppositely disposed walls as well as with an insert of vibration-damping material. The insert is of a thickness to abut each wall and is of greater dimension than the aperture. Also, the insert may be of solid, annular or hollowed shape and may be shouldered to project through the aperture, for example to form a guide surface for the section member. The section member can be used as part of a weaving shaft or as a rod-like or bar-like element in a drive shaft of a weaving machine.

Abstract: An improved method and apparatus for venting hydrocarbon gases from the cargo compartments of a tanker vessel for the transportation of oil in water, which tanker vessel includes a hull comprising a bottom and sides, a top deck, a plurality of watertight cargo compartments disposed in the hull between the top deck and the hull bottom for receiving the oil, and vent means coupled to each of the cargo compartments and communicative externally of the compartments for venting hydrocarbon gases to and from the cargo compartments and the atmosphere during loading, discharge and transfer of oil and ballast from the compartments.

Abstract: A numerically controlled nibbling machine including means for controlling the feed rate of the work piece with respect to the work tool of the machine and in which the feed distance or travel of the work piece is limited by a release time in which the work tool is disengaged from the work piece according to a predetermined number of strokes of the work tool per unit of time. The improvement of the invention comprises the provision of means for determining the release time of the work tool in a single stroke of the work tool for any number of strokes of the tool, and means for automatically determining the minimum accelerations and decelerations of the work piece required for travelling the feed distance and for forming a desired feed rate value for the work piece from the determined release time of the work tool and the feeding distance of the work piece per stroke.

Abstract: A method for determining a measurement value proportional to the compression of an internal combustion engine, derived from the starter current, in which the a-c component of the starter current is integrated over the time between successive current minima and the difference between an integration value averaged over an engine cycle and integration values for individual cylinders obtained between succeeding current minima, is added, with the sign reversed, to the integration value for the next-following cylinder.