Abstract
An apparatus for the continuous registration of the total ionization component of cosmic rays at sea level has been set up at Rome. The purpose is to study the correlations between cosmic ray intensity and atmospheric, geomagnetic and solar phenomena. The apparatus consists of telescopes of Geiger-Muller counters in triple coincidence, directed vertically, and inclined at 30° to the vertical in the direction South and North respectively. The difference between the diurnal variations in two inclined directions is considered free from atmospheric effects and is thus able to show up an anisotropy of the primary radiation. There are four independent telescopes in each direction, with a total of about 27 000 coinc./h in North and South directions respectively, and about 48 000 coinc./h in the vertical. The counters are held thermostatically at (30±1)°C. The methods used to reduce the instrumental inequalities and to obtain the maximum operational stability and continuity are described. The preliminary results obtained in the first counting period, from January to March 1954, are presented.
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