Abstract: Method and apparatus for high volume preparation of cross-sectional specimens of printed circuit boards for microscopic examination, including a method and apparatus for precision mounting of a large number of such cross sections in a single molding sequence for simultaneous polishing of such cross sections in a single polishing operation.

Abstract: Apparatus for high volume preparation of cross-sectional specimens of printed circuit boards for microscopic examination, including a method and apparatus for precision mounting of a large number of such cross sections in a single molding sequence for simultaneous polishing of such cross sections in a single polishing operation.

Abstract: An alumina slurry supply system for use in conjunction with a polisher or grinder apparatus or the like for preparing the surfaces of metallurgical specimens, the system comprising an alumina slurry reservoir, a recirculation pump disposed in the reservoir, an applicator arm for dispensing the abrasive slurry to a platen or lapping wheel of the polisher or grinder apparatus, a first conduit for receiving slurry pumped from the reservoir, a second conduit connected to the first conduit for recirculating the slurry to the reservoir, a third conduit leading from the first conduit to the applicator arm, a valve in the third conduit movable between an open position to supply abrasive slurry to the applicator arm and a closed position in which all abrasive slurry pumped from the reservoir is recirculated thereto, and a timer for controlling the operation of the valve.

Abstract: A chuck for suspending a specimen holder from a vertical drive shaft to permit the specimen holder to be rotated about the axis of the drive shaft and also pressed downwardly against an abrasive platen or the like which may also be rotated in the same or opposite direction, the chuck being biased to its locking position by a spring and being releasable through manual rotation of a sleeve member to overcome the spring force.

Abstract: Four switches are arranged at 90.degree. to each other. Each switch has a reversely bent blade having a short leg pivoted on a center terminal and a long leg having its free end normally spaced from a normally open terminal while the reversely bent portion engages a normally closed terminal higher than the other two terminals whereby the normally open terminal of an adjacent switch can be positioned under the normally closed terminal. The actuator handle actuates opposed parallel pairs in unison whereby one of the pair is actuated to close on its normally open terminal when the actuator moves in one direction and the other of the pair is so actuated when the actuator is moved in the opposite direction.

Abstract: Apparatus and method for continuously removing ferrous particulate matter from an image bearing element being transported along a predetermined path in an electrostatic copying machine.Ferrous particulate matter is magnetically attracted away from the element as it moves along its path. A receiver, preferably movable on an endless path, receives the particulate matter attracted away from the element and conveys the particulate matter to a predetermined location.

Abstract: Sheet separating apparatus for separating the bottom sheet from a sheet stack while at the same time adapted to adjust to any non-uniformity in thickness of portions of the sheet as each sheet enters a nip between a friction member and a sheet conveyor of substantial breadth. The sheet separating apparatus includes a broad friction member which is biased toward engagement with a broad, load distributing conveyor which transports the sheet material. The friction member is supported in such a manner that it can tilt about an axis which is parallel to the sheet path, and thus adjust itself in accordance with any variations in thickness of that portion of the sheet which the conveyor encounters as it enters the nip between the friction member and the conveyor. This arrangement causes a uniform pressure to be generated by the various portions of the friction member upon the various portions of the conveyor, and thereby to have a more uniform effect upon the portions of the sheets as they enter the nip.

Abstract: Corona electrodes in electrostatic copying machines take the form of a fine gauge wires, and when subjected to toner an atmosphere with a high density of particle dispersion, can become covered with a deposit which impairs their effectiveness. Cleaning of such a wire is situ without danger of injury thereto is effected by periodically inducing vibrations in the wire, either by controlled mechanical plucking, or by electromagnetically or electrostatically inducing vibrations.