Abstract: A method and apparatus for measurement of time required for an ultrasonic tone burst to traverse a medium from a transmitter to a receiver is disclosed. Two transducers separated by a distance through which a medium flows alternatively act as a transmitter and then a receiver of ultrasonic signals. After a signal has been emitted from the first ultrasonic transducer, the second transducer is electronically checked for receipt of the ultrasonic signal. That checking is done at certain time intervals, preferably 4 microseconds, over a selected period of time. Samples are taken over each time interval. For each sample time slot the presence and strength of an output signal is measured. An address in a memory is selected which corresponds to each sampling time slot. Each input sample is stored in memory at an address which corresponds to the time slot at which the input sample was taken.

Abstract: An aerobic exercise hand weight structure is provided particularly adapted for aerobic and related extended-time type exercises having an elongate body member with a soft, resilient central hand portion, and a hand engaging member resiliently connected at each end of the body member, said hand engaging member extending outwardly transversely to the body member and then generally parallel thereto to pass around the back of the hand preferably between the knuckles and wrist of a user to hold the hand resiliently between the central hand portion of the body member and the hand engaging member.

Abstract: In an overhead electric traction system for railways, a simple and inexpensive cantilever structural assembly includes a pole (1) comprising a lower part (3), an upper part (4) which is separately formed with respect to and is mounted on the lower part and to which a cantilever structure (21) is attached and, inter-connected between the upper end of the lower part and the lower end of the upper part, a tubular insulator (3) of plastics insulating material. The insulator (3) will withstand any normal mechanical loading to which the pole (1) will be subjected while it is in service and is of such a shape as to provide the necessary minimum creepage path between neighboring ends of the lower part (3) and upper part (4) of the pole.

Abstract: The specification discloses a calculator and method for calculating degree of offset and angularity of two shafts coupled together. At least one illustration of two machines having coupled shafts with gauges mounted on them appears on the face of the calculator. A series of indicator lights are placed near the illustration which light in sequence to indicate to the user what measurements to take and the sequence in which to enter this data. The calculator contains the appropriate equations in its memory for calculating offset and angularity from the data entered by the user.

Abstract: An optical microscope and a method are described wherein a luminescent specimen is located in, and illuminated by, a nodal standing wave field. Luminescence (fluorescence or phosphorescence) is excited in a series of parallel equispaced laminar antinodal zones separated by a series of dark nodal zones that span the specimen. By controlling the node spacing and phase of the standing wave field, a set of luminescence images of the specimen can be observed and recorded. Means can be provided for computing a three-dimensional distribution of light emitters within the specimen from this set of images.

Abstract: A bearing and seal structure and a vertical slurry pump incorporating such bearing and seal are provided including a housing surrounding a shaft for submerged operation comprising a housing surrounding a shaft, a rotatable sleeve removably fixed on said shaft and rotating therewith in said housing, a stationary sleeve fixed in said housing surrounding and in bearing contact with said rotatable sleeve, passage means in said housing and stationary sleeve carrying lubricant to the interior of the stationary sleeve in contact with the rotatable sleeve and a continuous pressure lubricant source supplying continuous lubrication to said passage means and between the rotatable and stationary sleeves.

Abstract: A multiply extensible lifting frame is provided having a standing mast and one or more middle and inner masts slidable relative to one another, at least one lifting press cylinder connected with the standing mast having a piston connected to the intermediate mast, at least one chain connected at one end with the standing mast and at the other end with the inner mast and supported over a roller on the middle mast, an additional hydraulically actuated element connected with the inner mast and carrying a chain over a roller thereon, the chain connected at one end to the inner mast section and at the other end to the lift slide the improvement in which hoses provided for supplying the additional hydraulically actuated element connected with the farthest extensible mast section are carried in the same plane and which the at least one chain connected with the standing mast and the farthest extensible mast and each hose is connected with a connection in one end, a bore hold on the side of the front flange of the col

Abstract: A power clamp assembly is provided having a base, a body rotatable on the base with spaced radial shelves of different heights, a hydraulic cylinder with piston in said body relatively rotatable therein, a hollow rod in said piston adjustable axially thereof and carrying a radial arm adapted to clamp a workpiece against a radial shelf on the body, a clamp structure for clamping said body and cylinder to the base at preselected positions and an inlet connected to a source of fluid pressure for introducing fluid pressure into said cylinder for moving the piston, rod and radial arm to clamping position.

Abstract: A hydrostatic drive is provided having an adjustable pump connected with a pump servo positioned by a control pressure from a line connected between the consumer and an adjustable measuring restrictor which in turn is connected to a switching means which includes a plurality of hollow ended main spools in boreholes in a housing, and secondary spools in said hollow ends acting with radial passages in the main spool to form parallel connected restrictors.

Abstract: A multiple consumer hydraulic device is provided having a pump and at least two consumers, where a multiway control valve throttling in the intermediate positions is located in front of each of these consumers and a hydraulically controlled additional valve is located in the line between the pump and this mulitway control valve and is acted upon in the closing direction by the pressure in front of this multiway control valve and is loaded in the opposite direction by the pressure of the assigned consumer in which case, in order to achieve a load-independent proportioning of the pump stream for both pumps with and pumps without load-sensing, the additional multiway valve is provided with two additional control pressure chambers, of which the one acting in the closing direction is acted upon by the pressure of the one of the consumers carrying the highest pressure, and the oppositely acting additional control pressure chamber is acted upon by the pressure in the delivery line of the pump.

Abstract: A method for adding reactive metals to steel being continuously cast to eliminate the problem of tundish nozzle plugging is provided by the steps of continuously casting molten steel through a tundish nozzle while introducing a reactive metal into the molten steel in a form and at a point either above or below the tundish nozzle such that high melting oxides and/or oxysulfides of the reactive metal are not formed in an amount sufficient to cause plugging in the nozzle before passing through the nozzle. A flux can be introduced with the alloy or subsequent to the alloy addition that can lower the melting point of the reactive products below the temperature of the steel going through the tundish nozzle.

Abstract: Multiple strands of metal slit from strip which varies in thickness from edge to center are separately coiled on the same mandrel into uniformly tight coils by selectively working the strands so as to reduce the thickness and elongate thicker strands more than thinner strands. The working is preferably accomplished by imparting reverse bends to the strands while tensioning them in amounts less than the tensile yield strength of the metal.

Abstract: A flange adapter is provided for insertion between a flanged end valve and a plastic pipe having an elongate cylindrical member with a radial outward flange at one end for fastening to a metal valve flange, a second radial outward flange intermediate the ends of the cylindrical member, the other end of the cylindrical member having an enlarged bore with a frusto conical end, said bore receiving a plastic pipe end and a surrounding elastomer gasket with a frusto conical end, a follower abutting the gasket, a compressible frusto conical jaw assembly surrounding the plastic pipe end within a frusto conical opening of a back up ring and tightening means for separately moving the follower to compress the gasket sealingly on the plastic pipe and the back up ring to compress the jaws into the pipe end.

Abstract: A waterproof fabric sleeve or cover for a human limb has a cuff which can be wrapped tightly around the limb. To the inside surface of the cuff is affixed a circumferentially elongated fitting of resilient material thicker at its mid-section than at its ends and having a transverse groove at its mid-section dimensioned to hold an intravenous feeding tube. The groove is open at its inside surface an amount less than its greatest diameter. The sleeve is positioned on the limb so that the intravenous tube fits into the groove and the cuff is wrapped tightly enough to seal it to the limb. The fitting is positioned with a margin of the cuff on each side and the cuff margins seal it to the limb when the intravenous tube is removed.

Abstract: The apparatus is used in conjunction with a power center or distribution box of a multi-phase trailing cable resistance grounded power system in coal mines and the like. It provides from phase voltage an adjustable low voltage current source for adjusting the ground fault relay. The voltage is obtained from a phase-controlled triac and is rich in harmonics which makes it useful in locating cable faults in conjunction with any commercially available cable fault detector which operates at power or higher frequency.

Abstract: A slide number identifier is provided for elongate multi-number set lottery cards having said sets extending transversely of the card in succession comprising a single blank of plastic having at least two rectangular panels, at least one of which is translucent, said at least one translucent panel having sets of lottery numbers printed thereon in the alignment of a single transverse set of numbers as used on a lottery card with which the slide number identifier is to be used, said at least two panels being folded to side-by-side relation to form a sleeve through which the lottery card may be passed longitudinally and each transverse number set on the card aligned with the number sets on the translucent panel.

Abstract: A pipe coupling is provided having a sleeve with frusto-conical ends, elastomeric gaskets fitting in said frusto-conical ends, a follower at each end of the sleeve, tightening bolts acting on the followers to move them axially together to compress the elastomeric gaskets radially into sealing engagement with the pipe ends, a back up ring having a frusto-conical opening spaced from each follower opposite the sleeve, frusto-conical opening in each said back up ring having its largest opening toward said sleeve, a frusto-conical split jaw in each back up ring and auxiliary tightening means for moving the back up rings towards the adjacent followers to compress said jaws into the pipe ends.