Educational experiments in cosmic ray physics, carried out with small size Geiger counters, suffer of limited statistics. High schools however may share their equipment to use such counters in parallel to increase the statistics and allow for educational measurements of the cosmic ray flux in a reduced time. As a test, a measurement of the barometric coefficient for cosmic rays was carried out by the use of six counters and a specially designed fan-in circuitry.
A. et al. (Tue,) studied this question.