Abstract: In a separable mortar round of the type having a central cartridge chamber ithin the boom portion and provided with a plurality of flash holes extending outwardly of the chamber that improvement, which includes an adhesively bonded thin stainless steel foil disposed about the inner wall of the chamber and closing over the flash holes to provide increased liquid impermeability. The method of applying the aforesaid foil to the chamber wall by wrapping a foil on a hollow mandrel having a plurality of surface openings and applying a vacuum to said mandrel while simultaneously wrapping the foil thereabout. Coating both the foil and the inner chamber wall with an adhesive and inserting said mandrel into the separated boom for aligned disposition in the chamber. Thereafter gaseously sealing the mandrel in the chamber, releasing the vacuum, applying positive pressure to the mandrel and removing the same from the chamber.

Abstract: A sighting and laying system to properly aim the missile gyro axis to a petermined elevation and to orient this same axis in any desired horizontal direction. These functions are performed without any preleveling of the launcher elevating and slewing mechanism and permits the missile launcher to be located on up to a 6.degree. slope in any direction.