Abstract: The arm of a forging manipulator has tongues at one end for engaging with a workpiece and is journaled for rotation about a horizontal axis. At the other end the arm carries a pair of clamps each of which has a pair of clamping jaws pivotally connected at one end and adapted to be spread apart or drawn against the arm by a spreading hydraulic cylinder at the other end of each pair of jaws. The cylinders are interconnected for reversing operation and are hydraulically linked to a pair of drive cylinders, the pistons of which are pivotally connected to the respective clamps so that one of the drive cylinders is effective to rotate the arm when its clamping cylinder draws its jaws against the arm while the other clamping cylinder spreads the other pair of jaws apart during the ineffective stroke of the drive piston.

Abstract: A process for oxidation of silver and silver-plated articles having a violet or dark red decorative corrosion resistant coating by using an alternating current and as the electrolyte, a cupric chloride solution of concentration of 5 to 15 g/l.

Abstract: A technique for simultaneously measuring the concentricity of axially spaced cross-sectional locations of a nominally cylindrical test surface is described. A measuring cylinder is pneumatically supported coaxial with the mean axis of the test surface. A plurality of pairs of distance sensors are supported at axially spaced portions of the cylinder. Upon a rotation of the pneumatically supported reference cylinder about its axis, the successive distance readings of the sensors of each pair as such sensors come into registration with a given point on the periphery of the test surface is measured, and each such pair is then radially displaced as a unit by an amount equal to one half the difference between the distances detected by the successive sensors in the pair during the rotation.