Abstract: Workpieces, such as printed circuit boards, are processed by passing the boards in contact with a standing wave of molten solder formed by circulating molten solder upwardly through a nozzle to overflow at least one edge thereof to form a standing wave which is accelerated by gravity so as normally to have an upper surface ballistically curved in the direction of flow. In accordance with the invention, the undersurface of the standing wave is supported to have a ballistic curvature, in the direction of flow, such that a major portion of the upper surface of the wave is substantially planar with the cross-sectional area of the wave varying, in the direction of flow, in a manner similar to the variation of the cross-sectional area of an unsupported wave following a ballistic curve in is trajectory.

Abstract: A shock-resisting suspended cable trough assembly includes open channel supporting members extending transversely beneath the trough. At their ends, the channel members are formed with box channel end portions and the upper and lower webs of those box channel end portions are formed with aligned and open-ended slots to receive the threaded lower ends of generally vertical legs of respective hangers. At its upper end, each hanger is formed with a generally horizontal arm which is received in an opening in a mounting bracket depending from an overhead support so that the arm is generally parallel to the longitudinal direction of the trough. The arm of each hanger forms an integral extension of one limb of a generally horizontal U-shaped intermediate portion while the other limb of such U-shaped portion is integrally formed with the upper end of the leg of the hanger through an elbow.