CAMERA-OBSCURA FOR OBSERVATION OF EAS IMAGES IN CERENKOV LIGHT

A new instrument, a camera obscura with a number of light apertures (o r slits), is suggested for observation of EAS images in Cerenkov light . Its advantages (over mirror-imaging telescopes) are a low night-sky light noise, a wide field of view and absence of aberrations. This cam era is effective for measurements of bright objects such as EAS Of ene rgies higher than 10(3) TeV. Analysis of EAS images in the 'knee' regi on of the primary cosmic-ray energy spectrum (E(0) similar or equal to 3 x 10(3) TeV) could give new information on the expected variation o f cosmic-ray composition in this energy region.