A discharge chamber has been constructed with electrodes of transparent metallic mesh. By the addition of quenching agents, mainly I2vapor, to noble gases at atmospheric pressure, and the use of pulses of one or several microseconds duration, it is shown that a great number of discharges connecting the two electrodes can develop simultaneously, starting from the ionized path of a particle. Pulses in the microsecond range of 2 to 3 kV/cm are used, thus allowing the easy operation of large sensitive volumes. Tracks of good resolution are observed, with a variation of the luminosity as a function of the primary ionization. Repetition rates up to 104/sec are reached. Sparks following the trajectory of particles inclined at angles of 45° with respect to the electrodes are observed.