An array of sixteen, self‐quenching, Geiger counters is described, which employs a matrix of parallel, small diameter wires for electrodes. The gas atmosphere is common to all counters. The array and attendant recording circuit is used to observe the tracks of charged particles. A spurious count, caused by incomplete absorption of the photons by the polyatomic gas, occurs in a counter adjacent to the track for about 1.5 percent of the primary tracks.