We have developed a spark gap system which permits PMAS to be used for the recording of high speed events. PMAS is a high speed photographic facility which consists of a double spark generator used as an ultra short duration light source, an optical system, and on an electronic control unit which provides delay before and between successive frames. In applying the PMAS to record light emitting high speed phenomena, a principal problem has been the lack of reliable intense light source with very short radiating times and restricted radiating areas. At the same time it is desirable to increase the illumination power as far as possible. In order to resolve the problem, we developed a groove type spark gap light source on the assumption that the electric discharge occurs along and is confined to the groove, and that the circular character of the spark channel would insure continuous electric discharge action while preventing pinching. With a sequental operation of such spark gaps, PMAS has been used in spray atomization, ballistic, detonics, schlieren studies, shadowgraph, etc.