Abstract: Disclosed are a highly selective, highly sensitive method and apparatus for detecting vapors from explosives at low concentrations such as 1 part in 1014. Airborne explosives vapors are selectively adsorbed on a spiral-wound platinum or platinum-coated ribbon of a preconcentrator cartridge while trapping of nitrogen oxides is avoided. The vapors are released and partially decomposed to liberate nitric oxide gas by flash-heating of the ribbon, these products may then be pyrolyzed if necessary to complete the liberation of nitric oxide gas, and then the liberated nitric oxide gas is detected, as by chemiluminescent detection. Also described are various systems incorporating the explosives vapor detector such as a walk-through portal, a vehicle sniffer, and a system incorporated into the air-handling apparatus of a building.

Abstract: A roll-through cold forming apparatus adapted to form simultaneously a plurality of either external or internal straight spline or gear type teeth on a cylindrical workpiece carried on a movable ram. In one embodiment the apparatus includes a plurality of radially disposed pivotally mounted teeth forming blades which are disposed around the axis of movement of a linearly movable ram, whereby when the ram moves in one direction past the teeth forming blades, the blades are engaged by an interference contact with the workpiece carried on the ram, and the teeth forming blades are moved over the external surface of the workpiece in a rolling contact action so as to displace the material of the workpiece between each tooth forming edge of each of the blades. The material on the external surface of the workpiece is formed around the radius of each of the tooth forming edges of each of the forming blades on a line with the configuration of each tooth forming edge.

Abstract: A multi-spindle, biaxial turning machine having means for independent tool offset in either of the axes of tool movement. The turning machine includes a slide assembly comprising a compound slide movable in a first direction with respect to the spindle axes of rotation, a cross slide mounted in sliding relation on the compound slide and movable in a direction transverse to the spindle axes of rotation, and first and second auxiliary slides, each of the auxiliary slides mounted in sliding relation to the cross slide and carrying respective first and second tool holders movable in mutually transverse directions. The compound slide, cross slide, and auxiliary slides each have associated with them drive means, which in the preferred form include a servo-drive motor and associated ball screw drive. A motion sensor is associated with each of the drive means.