We describe the design, construction and operation of a compact cosmic rays (CRs) telescope of
TRASGO (TRAck reconStructinG bOx) type, consisting of four resistive plate chambers (RPCs),
located in Puebla City, Mexico, at a latitude/longitude of 18° 59’ 56” N/98° 11’ 41” W. and 2100
m.a.s.l. This telescope allows the detection of isolated muons with good angular resolution under
the use of quality cuts on the TDC signals. We describe the implementation of a webpage with
an event display that shows the hits on each of the 4 planes and the reconstructed trajectories of
isolated muons. We use these clean events to measure the azimuthal distributions of the muons
that cross the detector for various cuts on the zenith angle. We report on the measurement of
the East-West asymmetry of the flux of secondary cosmic-ray muons and compare with detailed
simulations of CRs based on CORSIKA software. Finally, we elaborate on the use of this type
of small detectors in education and outreach activities to measure several properties of secondary
cosmic-ray muons.