The EAS Size Spectrum measured at ANI Cosmic Ray Observatory in the region of Knee

The differential size spectrum of Extensive Air Showers (EAS) measured with the MAKET-ANI installation, located at Mt. Aragats, 3200m above the sea level, is presented. Measurements of the shower size are performed with an array of plastic scintillators as a function of the zenith angle. The knee of the EAS size = 1 76 0 05 10 : : 6 . The observed change of the spectral index of the size spectrum is observed at Nek 0 4 0 06 spectrum equals : : . The comparison with data of the EAS-TOP and the KASCADE installations are performed.