Reconstruction of muon height of production in Extensive Air Showers

An attempt has been made to select muons in Extensive Air Showers (EAS) by means of tracking telescopes and reconstruct their apparent height of produ ction along the shower axis. By this way a reconstruction of shower longitu dinal development in the Earth atmosphere can be obtained. Results indicate that the only information of muon arrival direction is not enough for the correct reconstruction of shower longitudinal development, mainly because o f the distorting effect of the Earth geomagnetic field and multiple coulomb scattering by air nuclei.