Abstract: A device for connecting in series between a source of electric power and an appliance which, without modifying the normal power connections or other parts of the appliance, isolates the capacitance to ground characteristic of the appliance from the power supply and allows the flow of electrical power to the appliance to be regulated by a mere touch, usually by a human finger, to a surface of the appliance.

Abstract: A laser system for medical applications has at least two lasers and a movable concave reflector. The lasers are capable of generating beams of coherent electromagnetic radiation. One of the beams, an aiming beam, is aligned to impinge the reflector, to reflect therefrom and to impinge a biological specimen. The reflector is moved until the beam is aligned to impinge the desired position. The reflector is held stationary and the second beam is generated. The second beam is also aligned to impinge the reflector to reflect therefrom and to impinge the same desired position as that impinged by the first beam.

Abstract: A powered wrench for connecting links of pipe, the wrench including means for operatively engaging a length of pipe with a power driven toothed roller to rotate the pipe in a desired direction. The wrench includes idler rolls for applying supporting and smoothing pressure to the pipe responsive to the actuation of pressure applying means carried by the wrench.

Abstract: An electrophoretic separation apparatus of the type described in U.S. Pat. No. 3,844,926 wherein the means for generating the electric field is constituted by an anode system and a cathode system, said systems being positioned on opposite sides of the annular separation chamber to one another and one or both of said systems comprising a semi-permeable membrane which defines the annular separation chamber, at least in part, and which is supported by a water-permeable resin-bonded cellulose fibre material, means for contacting said material with an electrolyte, and an electrode for supplying an electric current to the electrolyte.

Abstract: A drive assembly for use with mining apparatus such as conveyors or coal ploughs includes a chain tensioning device which is incorporated in the housing of a resilient coupling device which forms part of the transmission from a drive motor to the mining apparatus.

Abstract: A coupling device for cryogenic fluids which allows passage of liquid and vapor simultaneously through one coaxially arranged assembly. Principle features include low heat transfer insulation integral with the coupling and the ability to connect and disconnect it without use of tools. The coupling consists of a male and a female portion, each of which comprises three coaxially arranged metal tubes.