A single detector with an effective area of 2500 cm² was placed near the top tray. Eightfold coincidences between P and at least one counter of the fourth tray were recorded, indicating extensive penetrating showers. Anticoincidences, where P coincidences did not occur with any fourth tray counter, were attributed to local penetrating showers. The transition effect of local penetrating showers was measured in paraffin. Various thicknesses of absorber (48 cm × 48 cm) were placed above the top tray. Results showed that the transition effect in Colombo was similar to that in Manchester, suggesting no observable latitude effect. Extensive showers also showed an effect in paraffin, with an increase in coincidences from 0.107 ± 0.026 to 0.208 ± 0.035 coincidences per hour under 24.3 gm/cm² of paraffin. The origin of cosmic rays was discussed, with the question of whether they come from outside the galaxy. The isotropy of cosmic rays was considered, but it was argued that this could be due to a magnetic field in interstellar space. Calculations suggested that the necessary magnetic field for deflection was much smaller than the average interstellar field. However, even with this, the magnetic field was still too weak to significantly affect cosmic rays. The inequality H² << 4πW was used to show that the magnetic field's effect is negligible. This led to the conclusion that cosmic rays must originate outside the galaxy, requiring an energy density of ~10⁻¹³ ergs/cm³ in interstellar and inter-nebular space. J. W. Dungey and F. Hoyle discussed these findings.A single detector with an effective area of 2500 cm² was placed near the top tray. Eightfold coincidences between P and at least one counter of the fourth tray were recorded, indicating extensive penetrating showers. Anticoincidences, where P coincidences did not occur with any fourth tray counter, were attributed to local penetrating showers. The transition effect of local penetrating showers was measured in paraffin. Various thicknesses of absorber (48 cm × 48 cm) were placed above the top tray. Results showed that the transition effect in Colombo was similar to that in Manchester, suggesting no observable latitude effect. Extensive showers also showed an effect in paraffin, with an increase in coincidences from 0.107 ± 0.026 to 0.208 ± 0.035 coincidences per hour under 24.3 gm/cm² of paraffin. The origin of cosmic rays was discussed, with the question of whether they come from outside the galaxy. The isotropy of cosmic rays was considered, but it was argued that this could be due to a magnetic field in interstellar space. Calculations suggested that the necessary magnetic field for deflection was much smaller than the average interstellar field. However, even with this, the magnetic field was still too weak to significantly affect cosmic rays. The inequality H² << 4πW was used to show that the magnetic field's effect is negligible. This led to the conclusion that cosmic rays must originate outside the galaxy, requiring an energy density of ~10⁻¹³ ergs/cm³ in interstellar and inter-nebular space. J. W. Dungey and F. Hoyle discussed these findings.