Practice war head device

In a practice war head device for an artillery rocket composed of a frusto-conical head element having a hollow nose section and a hollow skirt section having a base, an impact detonator mounted in said nose section, a tubular jacket connected to the skirt section, a tubular dividing element concentric with the tubular jacket together defining an annular volume, a fog producing substance based on a carbon halogen or halogen carbohydrate substance and reactive metal or metal oxide powders in said annular volume, and an ignition core of a quick-reacting ignition substance capable of high gas formation in the tubular dividing element, the improvement which comprises said fog producing substance being loosely packed in the annular volume, and wherein closure elements closing off said annular volume are provided at the nose side and base side of the annular packing, at least the nose side closure element is displaceable towards the fog producing substance packing, and the connection between the skirt section of the head element and the tubular jacket, the connection between the central portion of the head element and the tubular dividing element, and the base of the skirt section, are constructed so that upon impact of the war head device, the base of the skirt section and nose side closure element will be displaced into the annular volume to thereby compress the fog producing substance against the base side closure element.